Which of the following statements are correct about static functions? 1 Static functions can access only static data. 2 Static functions cannot call instance functions. 3 It is necessary to initialize static data. 4 Instance functions can call

Which of the following statements are correct about static functions?

1 Static functions can access only static data.

2 Static functions cannot call instance functions.

3 It is necessary to initialize static data.

4 Instance functions can call static functions and access static data.

5 this reference is passed to static functions.