Creating a derived class from a base class requires fundamental changes to the base class.

It depends upon how the function func() has been defined in the base class. If the function func() is defined public in base class then an object of the derived class can access the function func().

Base class cannot access derived class members since it does not have any knowledge of the derived class.

We can derive from a base class even if it is present in an assembly.

This is known as multiple levels of inheritance.

The private members of the base class are never accessible outside the class.