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If each of the two parties of knights consists of exactly three members, which of the following is not a possible travelling party and route?
a) P,S,U by the northern route
b) P,S,T by the northern route
c) P,S,T by the southern route
d) P,S,U by the southern route
e) Q,R,T by the southern route

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(e)http://gpl4you.com/ask_questions-2569-Six-knights-P-Q-R-S-T-and-U-assemble-for-a-long-journey-in-two-traveling-parties-For-security
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HCL Other Question

Six knights - P,Q,R,S,T and U - assemble for a long journey in Two traveling parties. For security, each traveling party Consists of at least two knights. The two parties travel by separate routes, northern and southern. After one month, the routes of the northern and southern groups converge for a brief time and at that point the knights can, if they wish, rearrange their traveling parties before continuing, again in two parties along separate northern and southern routes. Throughout the entire trip, the composition of traveling parties must be in accord with the following conditions P and R are deadly enemies and, although they may meet briefly, can never travel together. p must travel in the same party with s Q can’t travel by the southern route U can’t change routes . If, when the two parties of knights encounter one another after a month, exactly one knight changes from
one travelling party to the other travelling party, that knight must be
a) P
b) Q
c) R
d) S
e) T