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 class