A 1 B 2 C 3d4e5f6g7h8i9j10k11l12m13. ∣∣ ∣ ∣ ∣ 1+a2x (1+b2)x (1+c2)x (1+a2)x. A = [ 1 1 0 3], b = [ 1 17 0 9]. This is called the convolution of a list. Therefore, c is the answer.
