(NOT CLEAR)  Question 14: What is the correct declaration for a file stream insertion operator for a class my_stuff::my_class a

#include <fstream> namespace my_stuff { class my_class { public: int i; }; //Declaration goes here }//ns my_stuff

    A. std::ofstream& operator<<(std::ofstream& ofs, const my_class&);

    B. const my_class& operator<<(const my_class&)

    C. std::fstream& operator<<(std::fstream& fs, const my_class&)

    D. std::ifstream& operator<<(std::ifstream& ifs, const my_class&)

    E. void operator<<(const my_class&)