What does Data Hiding refer to?

Which of the following statements are correct?

Is it possible to call a main() inside another main() function in C++?

How much memory does a function use up within an object?

Function Overloading is based upon the number and/or type of arguments passed.

In Java, how many times can classes be nested within a class?

Which of the following is an 'Intermediate Base Class' with regard to the given figure: Class A --> Class B (Derived) --> Class C (Derived)

In Java, how many times can classes be nested within a class?

Function Overloading is based upon the number and/or type of arguments passed.

How much memory does a function use up within an object?

Is it possible to call a main() inside another main() function in C++?