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If f(x)=(x-1)/(x+1) , then f(f(a x)) i...

If `f(x)=(x-1)/(x+1)` , then `f(f(a x))` in terms of `f(x)` is equal to (a)`(f(x)-1)/(a(f(x)-1))` (b) `(f(x)+1)/(a(f(x)-1))` (c)`(f(x)-1)/(a(f(x)+1))` (d) `(f(x)+1)/(a(f(x)+1))`

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