What is the convolution x(n) of the signals x1(n)={1,-2,1} and x2(n)={1,1,1,1,1,1}?

• A. {1,1,0,0,0,0,1,1}
• B. {-1,-1,0,0,0,0,-1,-1}
• C. {-1,1,0,0,0,0,1,-1}
• D. {1,-1,0,0,0,0,-1,1}