To answer this question, the user needs to know the concept of inheritance in object-oriented programming and how it is implemented in C#.
C# does not support multiple inheritance with classes, which means a class cannot inherit from multiple classes at the same time. However, C# does support multiple inheritance with interfaces.
Interfaces are a way to define a set of methods and properties that a class must implement. A class can implement multiple interfaces, which allows it to inherit functionality from each interface.
Abstraction is a concept in object-oriented programming that allows you to define a set of methods or properties without providing an implementation. This allows other classes to inherit from the abstract class and provide their own implementations of the methods and properties.