请问这个答案到底应该选什么？

[weixin_38059973]

QUESTION NO: 13 A user on an NIS client is trying to search for a specific host in the NIS database. The user sees the following error message when running the ypmatch command.
$ ypmatch 194.168.85.121 hosts Can’t match key 194.168.85.121 in map hosts.byname. Reason: no such key in map.
The ypcat hosts command on the client reveals the entry 194.168.85.121hostA.
What is the reason the user can NOT search and find the host 194.168.85.121?
A. The ypbind daemon was NOT running on the client.
B. The /etc/nsswitch.conf file was NOT configured to search NIS.
C. The ypmatch command should have used host.byaddr as its argument.
D. The ypmatch command searches the /etc/inet/hosts file, because the argument hosts was used instead of the more specific hosts.byname.
Answer: C