From the following items: X, Y, Z, A, and B, the selection rules are: 1) X and Y cannot be selected together. 2) If A is selected, then B must also be selected. 3) Z can be selected only if Y is not selected. Which of the following selections is valid?

Answer: C. X, Z
Option c (X, Z) is valid as it meets all conditions: X and Y are not together, A and B are not selected, and Z is selected without Y.