Discussion
When the child entity is required, we are restricted from creating a new parent row without also creating a corresponding child row at the same time.
Answer: A
Correct answer: True
If the child is required, a parent cannot exist without one, so creating a parent alone would immediately violate the constraint. The two rows must be created together, which usually means within a single transaction. This is the mirror image of the required-parent case, where it is the child that cannot be created alone.
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