Set is a templated abstract base C++ class to present a set (kme). It defines (but not implements) regular set functions: add, containsElement, intersection (kesiim), and size. SetA and Setc are derived concrete classes that implement all these functions. SetA is an adaptor class and uses suitable STL classes to keep the elements. Setc uses regular C arrays to keep the set elements. a) Write the class definition for Set class. b) Design and implement SetA class. c) Design and implement Setc class. d) Write a main function to test your classes.