A function returns a result after a try statement that has all four blocks. Three of the blocks print a word. def ratio(a, b): try: r = a / b except ZeroDivisionError: print("zero", end=" ") r = 0 else: print("ok", end=" ") finally: print("end", end=" ") return r print(ratio(6, 3), ratio(1, 0)) What is printed on the screen?