How many different visibility labels exist? 1 4 3 2 Protected variables only allow derived classes to access. True False Which of the following is not correct (in C++) ? (1) Class templates and function templates are instantiated in the same way (2) Class templates differ from function templates in the way they are initiated (3) Class template is initiated by defining an object using the template argument (4) Class templates are generally used for storage classes (2), (3), (4) (1) (4) (2), (4) inta=5intp=&A Which command changes the value of a to 6 ? &a=6;&p=6;p=6; None of the above