问题：

[多选] Which two statements correctly identify considerations to take into account when deciding onCampus 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
C .  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 or the link bandwidth should be reserved tor default best effort cla