Which version of .NET framework optional parameter is introduced?

Options :
  1. 3.0
  2. 3.5
  3. 4.0
  4. 4.5
Answer and Explanation :-

Answer: Option 3

Explanation:

4.0 is the .NET when optional parameter is introduced in .NET Framework. With this a constructor, Methods etc can be declare as with required or optional arguments .

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