Which of the following statements is/are true? (points : 5) a. a private () method

Which of the following statements is/are true? (points : 5) a. a private () method can only be used inside the class. it cannot be called through an object of the class.
b. the programmer can control the scope of a data member of a class using access specifiers.
c. the state of an object must be hidden and therefore protected by unauthorized use.
all of the above
only a and c