In Oracle Database administration, which group lists the various schema level database objects that can be created and managed, such as tables, views, indexes, sequences, synonyms, and clusters?

Introduction / Context:
This question checks your understanding of the core schema level objects that exist inside an Oracle Database. When people start learning Oracle administration or SQL, they often hear terms such as table, view, index, sequence, synonym, and cluster. These are logical objects that live inside a schema and are different from physical files like data files or redo log files. Knowing which items are schema objects is essential for both SQL development and database administration interviews.

Given Data / Assumptions:

- We are working with Oracle Database terminology.
- The focus is on logical schema objects, not operating system resources or physical storage files.
- Only one option lists items that are all schema level objects created with SQL DDL statements.

Concept / Approach:
In Oracle, a schema is a collection of logical objects that belong to a database user. Typical schema objects include tables that store row data, views that provide virtual tables based on queries, indexes that improve query performance, sequences that generate numeric values, synonyms that provide alternate names for objects, and clusters that store related tables together for performance reasons. These are different from physical structures such as data files, control files, or redo log files, which belong to the physical database layer.

Step-by-Step Solution:
Step 1: Read each option and identify whether the listed items are logical schema objects or physical or system level resources. Step 2: Recall that tables, views, indexes, sequences, synonyms, and clusters are all created using SQL DDL statements and belong to user schemas. Step 3: Observe that tablespaces, data files, control files, and redo log files are physical storage level entities, not schema objects. Step 4: Note that CPUs, memory, disks, and network cards are hardware resources, not database objects at all. Step 5: Schemas, users, roles, and privileges are security and logical containers, not all of them are schema objects in the same sense as tables and views. Step 6: Conclude that the only option which lists purely schema level database objects is the one containing tables, views, indexes, sequences, synonyms, and clusters.

Verification / Alternative check:
A quick way to verify is to ask whether each element in the list can be created with a CREATE statement that targets a schema, such as CREATE TABLE, CREATE VIEW, CREATE INDEX, CREATE SEQUENCE, CREATE SYNONYM, or CREATE CLUSTER. All items in the correct option satisfy this condition. The other options contain items that are either physical storage components, hardware elements, or high level security constructs, so they do not fit the definition of schema objects.

Why Other Options Are Wrong:
Option B is wrong because tablespaces, data files, control files, and redo log files are physical database storage structures, not schema objects. Option C is wrong because CPUs, memory, disks, and network cards are hardware resources managed by the operating system, not database objects. Option D is wrong because schemas, users, roles, and system privileges are related to security, ownership, and access control, and not all of them are schema objects created in the same way as tables and views.

Common Pitfalls:
A common confusion is to mix physical storage terminology with logical schema terminology. Learners sometimes assume that anything related to Oracle is a database object, even if it is actually an operating system resource. Another pitfall is to treat roles and users as schema objects when they are really security and identity constructs. Keeping a clear mental separation between schema objects, physical structures, and security entities will help in many Oracle interview questions.

Final Answer:
The correct group of Oracle Database schema objects is tables, views, indexes, sequences, synonyms, and clusters.