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Choose the namespace in which the interface IEnumerable is declared?

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Choose the namespace in which the interface IEnumerable is declared?

(a) System.Collections

(b) System.Collections.Generic

(c) Both System.Collections & System.Collections.Generic

(d) None of the mentioned

The question was asked in a job interview.

My question is from Fundamental of LINQ topic in chapter Delegates, Generics and LINQ of C#

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Correct choice is (b) System.Collections.Generic

The best I can explain: By definition.

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