Which statement about EtherChannels are true?
A. Ports in on mode accept PAgP requests.
B. A port in auto mode can form an Ether Channel with another port in auto mode.
C. Ports in on mode accept LACP requests.
D. PAgP is a Cisco-proprietary technology.
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swethchl.html#33461
Port Aggregation Protocol
The Port Aggregation Protocol (PAgP) is a Cisco-proprietary protocol that can be run only on Cisco switches and on those switches licensed by vendors to support PAgP. PAgP facilitates the automatic creation of EtherChannels by exchanging PAgP packets between Ethernet ports.