You need to determine where the trust boundaries will be in a new Company VOIP design.  Which  two statements are true about these trust boundaries？（）

A

Trust boundaries are configured in the core of the network to provide the most efficient  forwarding based upon QoS markings，

B

Setting trust boundaries at the edge of the network allows intermediate hop devices to  administer QoS policies without detailed packet identification.

C

Trust boundaries are used to determine which QoS mechanism will be applied to the traffic.  

D

At the trust boundaries， the untrusted traffic will be marked with a new QoS value appropriate  for the policy in place at the point where the traffic entered the campus network.  

E

Trust boundaries define the firewall rules for QoS admission into a network.