How does verifying data in a 4GL program differ from verifying data at the server level through constraints?

How does verifying data in a 4GL program differ from verifying data at the server level through constraints?
A . 4GL verification is more accurate.
B . Server constraints take up more memory.
C . Server constraints allow more programmer creativity.
D . 4GL verification is performed before the INSERT or UPDATE statement.

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Answer: D