A retirement system verifies that the field for employee status has either a value of A (for active) or R (for retired). This is an example of which type of check?

A retirement system verifies that the field for employee status has either a value of A (for active) or R (for retired). This is an example of which type of check?
A . Validity
B . Existence
C . Limit
D . Completeness

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Answer: A