Question: Suppose that a , b is a candidate key for a relation with schema ( a , b , c , d ) . Which

Suppose that a,b is a candidate key for a relation with schema (a,b,c,d).
Which of the following could be candidate keys?
[c]
a,b,d
[a]
a,c
[a,b.c]
[b]
Suppose that a,b is a candidate key for a relation with

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