A committee of four members is to be formed from the following individuals: P, Q, R, S, and T. The selection criteria are: 1) P and Q cannot be on the committee together. 2) R must be included if S is included. 3) T can only be included if P is not included. Which of the following combinations is valid?
Answer: B. Q, R, S, T
The combination 'Q, R, S, T' meets all criteria: P and Q are not together, R is included with S, and T is included without P.