attached Cisco IP phone to trust tagged traffic that is received from a device that is connected to the access port on the Cisco IP phone?

Which configuration tells a switch port to send Cisco Discovery protocol packets that configure an

attached Cisco IP phone to trust tagged traffic that is received from a device that is connected to the access port on the Cisco IP phone?
A . Router# configure terminal
Router(config)# interface gigabitethernet 5/1
Router(config-if)# platform qos trust extend
B . Router# configure terminal
Router(config)# interface gigabitethernet 5/1
Router(config-if)# platform qos trust extend cos 3
C . Router# configure terminal
Router(config)# interface gigabitethernet 5/1
Router(config-if)# platform qos trust extend cos 5
D . Router# configure terminal
Router(config)# interface gigabitethernet 5/1
Router(config-if)# platform qos extend trust

View Answer

Answer: A