This is in python, please provide explanation:

def add(x1,x2) return x1*x2 In the above function, what is the result? Select one: a. it doesn't work because while you can add 2, character sequences, you can't multiply two character sequences. b. It doesn't work because x1 and x2 are undefined. c. It works because the ASCll codes get multiplied together, producing a character d. It doesn't work because python doesn't do any mathematical operations on character sequences