Six friends - P, Q, R, S, T and U - are seated in a row, facing north. Exactly three people are sitting to the right of R. T is second to the left of R. P is third to the right of T. Q is not an immediate neighbour of P, nor does he sit at the either of the extreme ends. If Q is fourth to the left of S, where is U seated?
1
Second to the left of S
2
Immediate left of P
3
Third to the right of T
4
Second to the right of R