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If f(n)=1^2+2.2^2+3^2+2.4^2+5 .6^2+2.6^2...

If `f(n)=1^2+2.2^2+3^2+2.4^2+5 .6^2+2.6^2+...+ n` terms ,then (A) `f(n)= (n(n+1)^2)/2`, if n is even (B) `f(n)= (n^2(n+2)^2)/2, if n is even (C) `f(n)= (n^2(n+1))/2`, if n is odd (D) f(n)= (n(n+3)^2)/2` if n is odd

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