Your system contains the line:

search uk.sun.com central.sun.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.