Which statement is true？（）

• A、Compilation fails because the hashCode method is not overridden.
• B、A HashSet could contain multiple Person objects with the same name.
• C、All Person objects will have the same hash code because the hashCode  method is not overridden.
• D、If a HashSet contains more than one Person object with name="Fred"， then removing another Person， also with name="Fred"， will remove them all.