C++ Static Data Question:

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Which of the following are true about static member function?

1. They can access non-static data members
2. They can call only other static member functions
3. They can access global functions and data
4. They can have this pointer
5. They cannot be declared as const or volatile

a. Only 2
b. Only 2,5
c. Only 2,3,4,5
d. Only 2 , 3 , 5
e. All of these