What is the most likely cause for the issue on the port-channel?

A Dell Networking N3024 has a link aggregation configured as shown:

interface Gi1/0/1

channel-group 1 mode active

exit

!

interface Gi1/0/2

channel-group 1 mode active

exit

!

interface port-channel 1

switchport access vlan 10

exit

After connecting all cables, the port-channel does NOT work as expected.

As part of the troubleshooting process, the technician examines the “show lldp” displayed:

What is the most likely cause for the issue on the port-channel?
A . The interface port-channel is not using 10Gbps interfaces.
B . The interfaces on the N2024 switches are running LACP.
C . The interface port-channel is not configured in trunk mode.
D . The interfaces are connected to different switches.

Answer: D