If virtual functions are defined in the base class then _______________
(a) It is not necessary for derived classes to override those functions
(b) It is necessary for derived classes to override those functions
(c) Those functions can never be derived
(d) Those functions must be overridden by all the derived classes
I had been asked this question during an interview.
This interesting question is from Overriding Member Functions in division Member Functions & its Types of Object Oriented Programming