Consider the C$++$ class definition below. Which of the following statements is true?class Employee $\{$public:private:$\}$;Group of answer choicesMember functions are usually in the 'private' portion of the class.Member variables are usually in the 'public' portion of the class.The access specifier 'private' identifies the interface portion of the class.The access specifier 'private' identifies the implementation portion of the class.