Which two statements correctly identify considerations to take into account when deciding on Campus QoS Design elements?（）

A. Voice needs to be assigned to the hardware priority queue.
B. Voice needs to be assigned to the software priority queue.
Call signaling must have guaranteed bandwidth service.
D. Strict-priority queuing should be limited to 50 percent of the capacity of the link.
E. At least 33 percent of the link bandwidth should be reserved for default best-effort class.