For each of the following functions, determine the corresponding worst-case runtime complexity when called with an input list of size N. Assume the input list is a Python (array-backed) list 13. def fA(N, x): accum 0 while N 1: accum + N return accum (b) O(log N) (c) O(N) (d) o(N2) 14. def fB(M, N) accum 0 for i in range(1, M, M//10): for j in range(1, N, N//10): ifi