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