3. A pure virtual function is a member function (more than one)
a) Whose declaration ends with = 0.
b) That is used in a derived class only.
c) That is used in a base class
d) Takes no arguments
e) Member form that is used to force all derived classes to implement that member function or be a pure virtual function member of the derived class.
I have selected A and D, but I am not sure if is also C