A network administrator of a 50 machine network is receiving complaints that some users are losingconnectivity to network services. On inspection it is discovered that the IP (Internet Protocol) addresses for the subnet of 255.255.255.128 have been exhausted. Which of the following explains the problem?

A.
The subnet range needs to be changed to 255.255.255.0 to accommodate more users.

B.
A DNS (Domain Name Service)A record has been deleted for the DHCP (Dynamic Host Configuration Protocol) server path and must be re- established.

C.
The network router has lost its connection to the DHCP (Dynamic Host Configuration Protocol) server and must be rebooted.

D.
A rogue Windows DHCP (Dynamic Host Configuration Protocol) server is running a man-inthe-middle attack and has exhausted the IP (Internet Protocol) stack.