If a function has to be called only by using other member functions of the class, what should be the access specifier used for that function?

If a function has to be called only by using other member functions of the class, what should be the access specifier used for that function? Correct Answer Private

The function should be made private. In this way, the function will be available to be called only from the class member functions. Hence the function will be secure from the outside world.
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Which specifier should be used for member functions of a class?
Which of these is used as a default for a member of a class if no access specifier is used for it?