Which three statements are true of the Port Aggregation Protocol (PAgP)? (Choose three.)

A.
AnEtherchannel link will form if one end of the channel is configured as active and the other end
as passive mode.

B.
PAgP packets are sent with the command channel-group 1 mode desirable.

C.
PAgP does not require the STP costs to be the same in order to form an EtherChannel.

D.
PAgP is a standards-based protocol defined in IEEE 802.3ad.

E.
PAgP is used to connect to non-Cisco devices.

F.
AnEtherchannel link will form if one end of the channel is configured as auto and the other end
as desirable mode.