Which of the following is INCORRECT?

		a. A function can effectively return many values to the calling program -- for example, by using reference parameters or a struct.
		b. A function can return values input by the user.
		c. A function can return several values to the calling program with the return statement -- for example, return (numerator, denominator).
		d. A function can call another function.
		e. A function can be called many times in a program.