Key terminology — decide whether the following claim is correct: “Keys made up of two or more attributes are called composite keys.” Provide the best evaluation.

Introduction / Context: Schema designers often need multiple attributes to uniquely identify a tuple. When more than one attribute participates jointly in uniqueness, the resulting key has a specific name and properties.

Given Data / Assumptions:

• “Key” means a set of attributes that uniquely identifies rows (tuples).
• “Composite” implies more than one component attribute.
• We do not constrain whether the composite key is primary, alternate, or candidate.

Concept / Approach: A composite (or compound) key is exactly a key composed of two or more attributes. It can be a candidate key or the chosen primary key. The definition does not depend on normal form, foreign keys, or whether the attributes are natural or surrogate.

Step-by-Step Solution:

Verification / Alternative check: Example: Enrollment(student_id, course_id, term) might have primary key (student_id, course_id, term). This three-attribute primary key is composite.

Why Other Options Are Wrong:

• Foreign key status is irrelevant to being composite.
• Surrogate keys are artificial identifiers and may be single-attribute; composite does not imply surrogate.
• Normal form level (BCNF, 3NF) is unrelated to the definition.

Common Pitfalls: Confusing composite keys with concatenated values; assuming composite keys cannot be primary keys (they can); believing composite implies cross-table linkage (it does not).

Final Answer: Correct — that is the definition of a composite key