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Suppose that { a , b } is a candidate key for a relation with schema ( a , b , c , d )

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}
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