What makes a class abstract?

 Posted by Niladri.Biswas on 6/4/2013 | Category: C# Interview questions | Views: 5097 | Points: 40
Select from following answers:
  1. The class must not have method definitions
  2. The class must have a constructor that takes no arguments
  3. The class must have a function definition equal to zero
  4. The class which cannot be instantiated as they are mainly for inheritance
  5. All Above

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