Why do you want to usually make data members private in a class?

a. Ensure data integrity

b. Provide data abstraction

c. Provide information hiding

d. All of the choices apply.

6. A member function of a class should be made private:

a. always.

b. only if it will never be used.

c. if it will only be used by other members of the class.

d. never; it is illegal to make a member function private.