True or False: [11] Data members of a class should be made private to protect them from being accessed by non-members Definition of a member function outside a class declaration must not be qualified with the class name using the scope operator Non member functions need such qualification Class invariants should be formulated to ensure that the data members always contain valid values If you do not provide a constructor for a class, the compiler will generate a default constructor Generally, a non member function cannot directly access private members of a class. A "friend" function of a class will require the function parameters to be passed by either value or reference A class variable can be declared as a pointer variable too A friend function of a class has direct access to the class's data members The return type of a constructor is void The this pointer holds the memory address of the object itself