Question:How does the set collection deal with duplicate elements? 

A Duplicate values will cause an error at compile time. 
B A set may contain elements that return duplicate values from a call to the equals method. 
C An exception is thrown if you attempt to add an element with a duplicate value. 
D The add method returns false if you attempt to add an element with a duplicate value. 

+ Answer
D 

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Mohammad Towhidul Islam

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