C++ question: Which of the following is a valid overloaded method for CalculateSum()? __________ (2 points)

int CalculateSum (int num1, int num2)

Select one:

a. void CalculateSum (int num1, int num2)

b. double CalculateSum (int num1, int num2)

c. double CalculateSum (double num1, double num2, double num3)

d. All of the selections