Question: An instance of relational schema R ( A , B , C ) has distinct values of A including NULL values. Which one of the

An instance of relational schema R(A,B,C) has distinct values of A including NULL values. Which one of the following is true?
A is a candidate key
A is not a candidate key
A is a primary Key
Both (A) and (C)
An instance of relational schema R(A,B,C) has distinct values of A

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