Which of the Following Statements About Manipulating Objects in a Set

Multiple Choice

Which of the following statements about manipulating objects in a set is correct?

A) If you try to add an element that already exists, an exception will occur.
B) If you try to remove an element that does not exist, an exception will occur.
C) You can add an element at the position indicated by an iterator.
D) A set iterator visits elements in the order in which the set implementation keeps them.