Exercise 2 [Loops] Add the following three functions to a file called t3functions.py. Factorial: In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, 5! = 5* 4*3*2* 1. For this exercise, create a function called factorialWhile() that takes a single integer parameter n and returns n!. Write this function using a while loop. Next, add a function called factorialFor() that outputs the same result as factorialWhile() but uses a for loop instead of a while loop. Finally, add a function called numberOfVowels() that counts the number of vowels in a string. For this problem, vowels will consist of the letters a,e,i,o,u (both upper and lower case). You can use the provided tutorial3.py file to test your functions