If V1 Is a Vector< Int > Containing Some Number

If v1 is a vector< int > containing some number of int elements sorted in ascending order, after these statements execute:
Std::vector< int > results1;
Std::vector< int > results2;
Std::unique_copy v1.begin) , v1.end) , std::back_inserter results1 ) ) ;
Std::reverse_copy v1.begin) , v1.end) , std::back_inserter results2 ) ) ;
Which of the following could be true?

A) results1 contains more elements than results2.
B) The first element in results1 matches the last element in results2.
C) results1 is empty but results2 is not.
D) None of the above.