Four friends - A, B, C, and D - have different pets: a dog, a cat, a bird, and a fish. A does not have a dog or a cat. B has a pet that is not a bird. C does not have a fish. Who has the cat?
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?