Question: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 explicitly contain a collection. 

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

C The method must be the only iterator in the class. 

D The method must return a type of IComparable. 

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