This lab practices defining and implementing class, and working on array of objects of the class type. Requirement Modify the Rational class from lab 6 as follows: 1. add a set function that sets both numerator and denominator of the invoking object to the values provided in parameter: Rational a; a.set(1, 100); // this sets a to be 1/100 2. For all parameters that are of Rational type, use pass-by-reference (to avoid copying the whole object when passing parameters). If the function is not supposed to modify the parameter, use const before the parameter type. 3. Specify the sum function to be a friend function instead of member function (Keep in mind that wed use friend function when task being performed involves more than one object). The sum function will return the addition of two Rational numbers. 4. Follow the example of sum function to declare and implement a subtract function (as a friend function) which returns the subtraction of two rational numbers. 5. Follow the example of sum function to declare and implement a product function (as a friend function) which returns the product of two rational numbers. 6. Extra credit: declare and implement a private function called simplify that simplifies the invoking object is stored as 4/12, the function will simplify it to be 1/3. Hint: You will need to find the gcd(greatest common divisor) of the numerator and denominator, and then update them by dividing them by the gcd. The iterative version of implementation is given below: