Which two tasks must you perform on a device to ensure that an Etherchannel operate at Layer 3? (Choose two.)
A. configure no switchport on physical interface
B. configure EtherChannel directly on the interface
C. switchport mode trunk
D. configure switchport on E. configure switchport mode access
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_53_se/configuration/guide/3750xscg/swethchl.html
switchport mode { access | trunk }
switchport access vlan vlan-id
Assign all ports as static-access ports in the same VLAN, or configure them as trunks.
If you configure the port as a static-access port, assign it to only one VLAN. The range is 1 to 4094.
For cross-stack EtherChannel configurations, ensure that all ports targeted for the EtherChannel are either configured for LACP or are manually configured to be in the channel group using the channel-group channel-group-number mode on interface configuration command. The PAgP protocol is not supported on cross- stack EtherChannels.