单选题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？（）AThe method must return a type of either IEnumerator or IEnumerable.BThe method must return a type of IComparable.CThe method must explicitly contain a collection.DThe method must be the only iterator in the class.
单选题
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.
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