⟩ 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