What is an abstract class? (C#)

Here is the answer of the question: When an object in C# is serialized, what is it converted to?

• a class that is denoted by the class keyword (can be seen and used by any other class in the system–thus it is by default public)
• something denoted by the abstract keyword and used system wide; if you want any program to create an object of a class you use the abstract class
• a class that is denoted by the virtual keyword
• a class that can be used only as base class

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