From the following items: 1) Red, 2) Blue, 3) Green, 4) Yellow, the selection criteria are: 1) Red and Blue cannot be selected together. 2) Green must be selected if Yellow is selected. Which of the following combinations is valid?
A, B, C, D, and E are five students. The following conditions are true: A scored higher than B and C. D scored lower than E but higher than A. Who scored the lowest?