Which of the following best describes the ON DELETE CASCADE referential integrity constraint?

Which of the following best describes the ON DELETE CASCADE referential integrity constraint?

A.
If a parent key is deleted, any child keys referenced by the parent key are automatically
deleted.

B.
If any child key references a parent key, the record containing the parent key cannot be
deleted.

C.
If a parent key isdeleted, all child keys are automatically set to a specified value.

D.
If a parent key is deleted, no test is made for referential integrity.