If \[f(x)=4x-{{x}^{2}},x\in R,\] then \[f(a+1)-f(a-1)\] is equal to

1.	If \[f(x)=4x-{{x}^{2}},x\in R,\] then \[f(a+1)-f(a-1)\] is equal to
A.	\[2(4-a)\]
B.	\[4(2-a)\]
C.	\[4(2+a)\]
D.	\[2(4+a)\]
Answer» C. \[4(2+a)\]

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If \[f(x)=4x-{{x}^{2}},x\in R,\] then \[f(a+1)-f(a-1)\] is equal to

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