Which of the following cannot be used to declare a class as a virtual?

(a) Methods

(b) Properties

(c) Events

(d) Fields

I had been asked this question in class test.

The query is from Method Overriding in chapter Object Oriented Concepts of C#

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  }
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  (B) 5 and 12
  (C) 5 and 20
  (D) 12 and 20
  
  

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