Which action is necessary to complete the configuration if the ISP uses third-party network devices?

An engineer configures interface Gi1/0 on the company PE router to connect to an ISP. Neighbor discovery is disabled.

Which action is necessary to complete the configuration if the ISP uses third-party network devices?
A. Disable autonegotiation.
B. Enable LLDP globally.
C. Enable LLDP-MED on the ISP device.
D. Disable Cisco Discovery Protocol on the interface.

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