4. (Program) a. Create a multiplication operator function for the Complex class in Program 11.8 that multiplies two complex numbers. Use the relationship that (a + bi) (c + di) = (ab bd) + (ad + bc)i. b. Include the function constructed for Exercise 4a in a complete C++ program.

** This is Program 11.8: Need to create a multiplication operator function as instructed above: **

#include using namespace std; 2 4 class Complex private: double realPart; double imaginaryPart; 10 public: Complex (double real e.0, double imag-e.e) frealPart- real; imaginaryPart-imag:) 12 13 void showComplexValues(); void assignNewValues (double real, double imag); 15 16 17 18 19 20 21 void Complex:: showComplexValues() Complex operator+(const Complex&); char sign- +'; if (imaginaryPart