Consider the following class definition:

class classB { public int M { get; } public classB(int m) { M = m; } public virtual int Sqr() { return M * M; } } 

Create a new class classC that extends classB and has the following characteristics:

A read-only property of type int named R

A constructor with two parameters. The first parameter intializes M, the second parameter initializes R

An override of the method sqr that returns the square of M + R