21. What is a output of the following Python program if input is 4? (2 points) num= int(input("Enter a number: ")) factorial = 1 if num < 0: print("Sorry, factorial does not exist for negative numbers") elif num 0: print("The factorial of 0 is 1") else: for i in range(1,num + 1): factorial factorial*i print("The factorial of",num,"is",factorial) ANSWER: