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C# related question

faizyab 2009 asked:

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guys i need your help please . my question is

Which of the following are true about Extension Methods?

1.they can be declared either static or instance members.

2.extension methods can be used to override existing instance methods

3.extensio methods with the same signature for the same class may be declared in
multiple namespace without causing comilation errors.

4. they must be declared in the same assembley(but may be in different source files)

please tell me right answer
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