6 boys A, B, C, D, E and F are standing in a row facing North. A and B cannot be either at 1^st or 2^nd place. C and D will always be together and C must be at one of the ends. C does not have D to his right. Who is standing on the west end?

E or F

All the members are facing north

A and B cannot sit at first and second places

C does not have D to his right.

E or F standing on the west end.