Consider the following recursive function: int mystery(int number) { if (number == 0) return number; else return (number + mystery(number - 1)); } a) Identify the base case. b) Identify the general case. c) What valid values can be passed as parameters to the function mystery? d) If mystery(0) is a valid call, what is its value? If not, explain why. e) If mystery(5) is a valid call, what is its value? If not, explain why