3. Consider the following program specification and implementation for determin- ing the mth Fibonacci number fm for me N. (Recall that the Fibonacci sequence is defined as fo=0, f1 = 1, and fm = fm-1+fm-2 for m > 2.) 1 CS-MATH 240: Spring 2021 it fib(m) for m EN O return 0 (1) if m= (2) else (3) C40 (4) x = 0 y 1 (5) (6) while c 2.) 1 CS-MATH 240: Spring 2021 it fib(m) for m EN O return 0 (1) if m= (2) else (3) C40 (4) x = 0 y 1 (5) (6) while c