Your system contains the line:
search uk. Certkiller .com central. Certkiller .com
In its local DNS configuration file.
Which is the purpose of this line?

A.
It defines the list of domains for which the system is a DNS server.

B.
It defines a list of domains to search when performing a host lookup.

C.
It defines a list of domains the system is allowed to query using DNS.

D.
It defines the list of DNS servers the system can use for DNS failover.