`A` and `B` are two events such that `P(A) = 1/4`, `P(B) = 1/2` and `P(A \cap B) = 1/8`, then `P(\bar{A} \cap \bar{B})` is --
(a) `3/4`, (b) `3/8`, (c) `1/2`, (d) `1/3`