Which of the following is used to define the members of a class externally in…

In C++, the scope resolution operator (::) is used to define class member functions outside the class definition. This allows the function body to be written separately from the class declaration. The colon (:) is used in constructors for member initialization, not for defining members externally. The hash symbol (#) is used for preprocessor directives like #include and #define, not for defining class members. Therefore, only the scope resolution operator is used for external definition of class members.