(Payroll System Modification) Modify the payroll system of Figs. 20.9–20.17 to includeprivate data member birthDate in class Employee. Use class Date from Figs. 18.6–18.7 to representan employee’s birthday. Assume that payroll is processed once per month. Create a vector of Employee references to store the various employee objects. In a loop, calculate the payroll for each Employee (polymorphically), and add a $100.00 bonus to the person’s payroll amount if the currentmonth is the month in which the Employee’s birthday occurs.

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