General Studies · Seating Arrangement

Directions: Eight people A, B, C, D, P, Q, R, and S are sitting around a square table. Four of them sit in the middle of the sides (facing outside) and four sit at the corners (facing inside). R is sitting second to the right of D. Only one person is sitting between R and S. Only one person sits between Q and P. A is sitting immediately to the left of R. Only two people sit between A and B. Q is sitting second to the left of C. C is sitting immediately left of S. P is not sitting in the middle of the table. Four of the following five are alike in a certain way and thus form a group. Which is the one that does not belong to that group?