Five books A, B, C, D, and E are arranged on a shelf. A is to the left of B, but to the right of C. D is to the right of E. What is the correct order of the books from left to right?
A team of three is to be formed from the following people: Alex, Brian, Clara, and Diana. The selection rules are: 1) Alex and Brian cannot be selected together. 2) Clara must be included if Diana is included. Which of the following teams is valid?