Features of an abstract class

Which of the following features does an abstract class have in C#?

1. An abstract class may contain abstract methods and accessors.

2. An abstract class cannot be instantiated.

3. A non-abstract class cannot be derived from an abstract class

Options
  1. 1, 2
  2. 2, 3
  3. 1, 3
  4. 1, 2 and 3

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