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If f(x)=1+nx+(n(n-1))/2x^(2)+(n(n-1)(n-2...

If `f(x)=1+nx+(n(n-1))/2x^(2)+(n(n-1)(n-2))/6x^(3)+………………+x^(n),` then `f^(")(1)=`

A

`n(n-1)2^(n-2)`

B

`n(n-1)2^(n)`

C

`n(n-1)2^(n-1)`

D

`(n-1)2^(n-1)`

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A
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