Refer to the exhibit.
A port channel is configured between SW2 and SW3. SW2 is not running a Cisco operating system.
When all physical connections are made, the port channel does not establish.
Based on the configuration excerpt of SW3, what is the cause of the problem?

- The port-channel mode should be set to auto.
- The port channel on SW2 is using an incompatible protocol.
- The port-channel trunk is not allowing the native VLAN.
- The port-channel interface load balance should be set to src-mac.
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