Which two command sequences must you enter on a pair of switches so that they negotiate an EtherChannel using the Cisco proprietary port-aggregation protocol? (Choose two.)

Which two command sequences must you enter on a pair of switches so that they negotiate an EtherChannel using the Cisco proprietary port-aggregation protocol? (Choose two.)
A . channel-protocol lacp channel-group 1 mode on
B . channel-protocol pagp channel-group 1 mode auto
C . channel-protocol lacp channel-group 1 mode active
D . channel-protocol pagp channel-group 1 mode desirable
E . channel-protocol pagp channel-group 1 mode on

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Answer: BD