An engineer must configure neighbor discovery between the company router and an ISP What is the next step to complete the configuration if the ISP uses a third-party router?

An engineer must configure neighbor discovery between the company router and an ISP What is the next step to complete the configuration if the ISP uses a third-party router?
A. Enable LLDP globally.
B. Disable CDP on gi0/0.
C. Enable LLDP TLVs on the ISP router.
D. Disable auto-negotiation.

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