In the ABAP language, which statement best describes events such as INITIALIZATION, START-OF-SELECTION, and END-OF-SELECTION?

Introduction / Context:
Classical ABAP reports use an event driven programming model. Instead of writing one long main function, the developer places code in event blocks such as INITIALIZATION, START-OF-SELECTION, AT SELECTION-SCREEN, and END-OF-SELECTION. The ABAP runtime then calls these blocks in a fixed order based on user actions and program type. This question checks whether you understand that these are predefined processing events handled by the ABAP runtime, not database triggers or operating system events.

Given Data / Assumptions:

• We are talking about events in ABAP reports and dialog programs.
• Events are declared using keywords such as INITIALIZATION and START-OF-SELECTION.
• The runtime system, not the database or operating system, controls the sequence of these events.
• The question asks which description fits these language events.

Concept / Approach:
ABAP events define logical phases in program execution. For example, INITIALIZATION runs before the selection screen is displayed, START-OF-SELECTION is the main data retrieval phase, and END-OF-SELECTION is used for list output after data selection. These blocks are not called manually by the programmer; instead, the ABAP runtime activates them when the corresponding phase is reached. This is different from database triggers, which run inside the database, and different from operating system signals or configuration flags. The core idea is that ABAP events structure program flow in a clear, standardized way.

Step-by-Step Solution:
Step 1: Recall examples of ABAP event blocks such as INITIALIZATION, START-OF-SELECTION, and END-OF-SELECTION. Step 2: Think about how these blocks are executed automatically when the report runs, without explicit CALL statements. Step 3: Compare the options and look for a description that matches predefined processing blocks controlled by the ABAP runtime. Step 4: Option A clearly describes this behavior, while other options incorrectly associate events with database or operating system mechanisms.

Verification / Alternative check:
You can verify by reviewing a simple ABAP report that contains only an INITIALIZATION event and a START-OF-SELECTION event. When you run the report, you see that both are executed in order, even though you never call them directly. If you add an AT SELECTION-SCREEN event, it runs when the user interacts with the selection screen. This behavior confirms that ABAP events are runtime controlled processing blocks.

Why Other Options Are Wrong:
Option B is wrong because database triggers are created in the database and are not ABAP language events. Option C is incorrect because operating system signals do not map to ABAP keywords such as START-OF-SELECTION. Option D is wrong because syntax checks are configured differently and are not tied to these events. Option E is incorrect because transport request types belong to the change and transport system, not to the ABAP event concept.

Common Pitfalls:
A common pitfall is to confuse ABAP events with events in other technologies such as database triggers or GUI events. Another mistake is placing logic in the wrong event block, for example performing expensive data selection in INITIALIZATION instead of START-OF-SELECTION. Understanding the purpose of each ABAP event and the fact that the runtime triggers them in a fixed order helps you write cleaner, more predictable programs.

Final Answer:
They are predefined processing blocks that the ABAP runtime calls automatically at specific points in the program flow