Create a class called Employee whose objects are records for an employee. This class will be a derived

class of the base class Person. An employee record has an employee's name (inherited from the class

Person), an annual salary represented as a single value of type double, a year the employee started work

as a single value of type int and a national insurance number, which is a value of type String.

Your class should have a reasonable number of constructors and accessor functions, as well as a print

function. Write a driver to fully test your class definition.