QUESTION 25 Which specifier makes all the data members and functions of base class inaccessible by the derived class? O Private O Protected O Public O both private and protected QUESTION 26 What is Spiral Model and How is it Used? T T T Arial 3 (12pt) T-SE 'S Path:p QUESTION 27 Explain with example and C++ syntax what a nested structure is? T T T Arial V 3 (12pt) 25