Which of the following statements describes the purpose of ndpmon?

Which of the following statements describes the purpose of ndpmon?
A . it monitors the network for neighbor discovery messages from new IPv6 hosts and routers
B . it monitors remote hosts by periodically sending echo requests to them.
C . it monitors the availability of a network link by querying network interfaces.
D . It monitors the network for IPv4 nodes that have not yet migrated to IPv6.
E . It monitors log files for failed login attempts in order to block traffic from offending network nodes

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Answer: A