While reviewing the result of scanning run against a target network you come across the following:

Which among the following can be used to get this output?

A.
A Bo2k system query.

B.
nmap protocol scan

C.
A sniffer

D.
An SNMP walk

Explanation:
SNMP lets you "read" information from a device. You make a query of the server (generally known as the "agent"). The agent gathers the information from the host system and returns the answer to your SNMP client. It’s like having a single interface for all your informative Unix commands. Output like system.sysContact.0 is called a MIB.