A SESSION’S GROUP MEMBERSHIP IS REEVALUATED WHENEVER CERTAIN ATTRIBUTES CHANGE, AND CAN BE TRIGGERED BY EXECUTION TIME OR I/O

9. þ B and C. A session’s group membership is reevaluated whenever certain attributes change, and can be triggered by execution time or I/O.ý A and D. A is wrong because CPU usage is used for the emphasis method, not for the absolute methods that can trigger a group change. D is wrong because the whole point of adaptive switching is that it should be temporary.