Question:Which of the following are true regarding the System.Collections.Generic.HashSet<T> class? 

A HashSet is an unordered collection. 
B HashSet requires that each element be unique as determined by either a supplied EqualityComparer or the default EqualityComparer 
C Operations on sets (Union, Intersection, etc) always create new result sets 
D HashSet provides functionality for "conceptual sets" where the rules for membership can be specified without actually creating all of the items. 

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B 

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Mohammad Towhidul Islam

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