which of the following is the correct way to declare a class in c ? group of answer choices class circle { private: double radius; public: void setradius(double radius); double getdiameter(); double getarea(); double getcircumference(); }; class circle { private double radius; public void setradius(double radius); public double getdiameter(); public double getarea(); public double getcircumference(); }; circle::circle(double radius) { private: double radius