Twelve friends are sitting in two parallel lines. There are 6 people sitting in each row and facing a person of the other row. In row 1, A, B, C, D, E and F are seated and all of them are facing north. In row 2, O, P, Q, R, S and T are seated and all of them are facing south but not necessarily in the same order. C, is third to the right of B. C is not an immediate neighbour to either E or A. P is third to the left of S. Neither P nor S are sitting at the extreme ends of any row. F, faces O, who is second to the right of T, and T is not an immediate neighbour to S. Only two people are sitting between Q and T. A, is not facing R. Which of the following pairs are sitting at the extreme ends?