A sales representative plans to visit each of six companies – M, N, P, Q, R and S exactly once during the course of one day. She is setting up her schedule for the day according to the following conditions:

(i)    She must visit M before N and before R

(ii)    She must visit N before Q

(iii)    The third company she visits must be P

If the sales representative visits S sixth, which of the following could be her first and second visits respectively?