Are there situations when iteration is the only option available to address a problem? If yes, please give an example. If no, please explain which should one prefer, recursion or iteration? Give the sequence of integers written by a call to ex233(6): defq3 (n): if n 0; return print (n) q3 (n - 2) q3 (n - 2) q3 (n - 3) print (n) Criticize the following recursive function and fix the bug def q4(n): s = q4 (n - 3) + str (n) + q4 (n - 2) + str (n) if n 0: return return s Consider the following recursive function: def mystery (a, b): if b == 0: return 0 if b% 2 = = 0: return mystery (a + a, b/2) return mystery (a +a, b/2) return mystery (a+a, b/2) +a