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单项选择题 You are developing a custom-collection class.You need to create a method in your class. You need to ensure that the method you create in your class returns a type that is compatible with the Foreach statement. Which criterion should the method meet？（）

A、The method must return a type of either IEnumerator or IEnumerable.

B、The method must return a type of IComparable.

C、The method must explicitly contain a collection.

D、The method must be the only iterator in the class.

  • A

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