Briefly explain the characteristics of reference-type variables that are supported in the C# programming language.

The variables that are based on reference types store references to the actual data. The keywords that are used to declare reference types are:

  1. Class – Refers to the primary building block for the programs, which is used to encapsulate variables and methods into a single unit.
  2. Interface – Contains only the signatures of methods, properties, events, or indexers.
  3. Delegate – Refers to a reference type that is used to encapsulate a named or anonymous method.
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