Here is the start of a class declaration:
class foo {
public:
void x(foo f);
void y(const foo f);
void z(foo f) const;
...
Which of the three-member functions can alter the PRIVATE member variables of the foo object that activates the function?
-Only y can alter the private member variables of the object that activates the function.
-Only x can alter the private member variables of the object that activates the function.
-All of the functions can alter the private member variables of the object that activates the function.
-Two of the functions can alter the private member variables of the object that activates the function.
-Only z can alter the private member variables of the object that activates the function.
