* A. Roll-up summary fields can cause the parent record to go through Save:
* When a roll-up summary field on a parent object (like Account) is updated due to changes in child records (like Branch), the parent record (Account) is implicitly saved again.
* This can result in the execution of the trigger on the parent object. Developers must consider this behavior to avoid unintended recursion or infinite loops.
Reference:Roll-Up Summary Field Considerations
C: The trigger may fire multiple times during a transaction:
Triggers can execute multiple times within a single transaction, especially when there are operations such as updates to the parent record caused by roll-up summary fields or workflows.
Developers should implement logic to ensure that the trigger handles multiple executions correctly (e.g., using a static variable to prevent recursion).
Reference:Apex Trigger Best Practices
Why not the other options?
B: Duplicate rules are executed once all DML operations commit to the database:
This is incorrect because duplicate rules executebeforethe DML operation is committed. Duplicate rules prevent duplicate records from being created or updated before the database operation occurs.
Reference:Duplicate Rules Execution
D: The validation rules will cause the trigger to fire again:
This is incorrect because validation rules do not cause triggers to fire again. Validation rules validate the record and may prevent DML operations, but they do not independently re-trigger the Apex trigger.
References:
Trigger Context and Recursion
Roll-Up Summary Field Documentation