A friend function

I. Can be invoked similar to other functions without using objects
II. Cannot access to other member functions directly
III. Cannot be called using the object of the class to which it has been declared as friend
IV. Can be declared only in the public part of a class

Options

a) I, II and III
b) I, II and IV
c) I, II, III and IV
d) IV only

Answer : c) I, II, III and IV