Next, design a class named CustomerData (with the appropriate header file and class implementation file), which is derived from the PersonData class. The CustomerData class must have the following private member variables : customerNumber as long integer type mailingList as boolean type The customerNumber variable will be used to hold a unique long integer for each customer. The mailingList variable should be a bool . It will be set to true if the customer wishes to be on a mailing list, or false if the customer does not wish to be on a mailing list. Write appropriate accessor and mutator functions for these member variables. Demonstrate an object of the CustomerData class in a simple program named CustomerTester. cpp