The impulse responseof a linear time invariant system is h (n) = {1,2, 1,-1}. The response for the input signal x(n) = {1,2,3,1} is

A

{1,8,4,8,3,-1,-2}

B

(1,4, 8,3, 8, -2, -2}

C

{1,4,8,8,3,-2,.-1}

D

{1,8,3,8,8,4,-1}