Assertion (A) : Al forms `[AlF_(6)]^(3-)` ions but B does not form `[BF_(6)]^(3-)` ions.
Reason (R) : B does not react with `F_(2)`.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true