Question: Determine the candidate key ( s ) for the relation R ( A , B , C , D ) , given the functional dependency

Determine the candidate key(s) for the relation R(A, B, C, D), given the functional dependency and multi-valued dependency:
i. A ->-> B
ii. A -> C, D
Group of answer choices
There are two candidate keys: A and B
There is one composite candidate key: (A, B)
There is one candidate key: A
There is one candidate key: B

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