Which of the followings is/are not false about friend function ?

1. It can be called / invoked with class object.

2. It has objects as arguments.

3. It can have built-in types as arguments.

4. It must declared only in public part of a class.

5. It does not have this pointer as an argument.

a. Only 2,4

b. Only 1,2,5

c. Only 2,3,5

d. All of these

ANSWER: Only 2,3,5