Use the ____ keyword to mark a class so that it can be used only as the base class from which other classes can be derived.
A) base
B) interface
C) virtual
D) abstract

Question

Quizplus · Accepted Answer

The keyword "abstract" is used to mark a class as abstract, which means it cannot be instantiated and can only be used as a base class for other classes. This ensures that any class derived from it must implement its abstract methods, making it a suitable choice for a class that is intended to be used as a base class. The other options (base, interface, and virtual) do not serve this purpose.

Use the ____ Keyword to Mark a Class So That