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Let f be a function defined by f(x)=4^x/...

Let `f` be a function defined by `f(x)=4^x/(4^x+2)``I_1=int_(f(1-a))^(f(a)) xf{x(1-x)}dx` and `I_2=int_(f(1-a))^(f(a)) f{x(1-x)}dx` where `2a-1gt0` then `I_1:I_2` is
(A) `2` (B) `k` (C) `1/2` (D) `1`

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