When troubleshooting Ethernet connectivity issues, how can you verify that an IP address is known to a router?

When troubleshooting Ethernet connectivity issues, how can you verify that an IP address is known to a router?
A . Check whether the IP address is in the routing table
B . Check whether an ACL is blocking the IP address
C . Check whether the IP address is in the CAM table
D . Check whether the IP address is in the ARP table

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Answer: D