A network administrator has configured the network on each floor of a four-story building to have the following different subnets: 10.0.10.0/24, 127.0.0.0/24, 172.16.0.0/24, and 192.168.255.0/24. After implementing these networks, the administrator realizes there has been a mistake. Which of the following BEST describes the mistake?
A. 10.0.10.0/24 is not valid because 0 in the second octet cannot be used in the network portion of the IP address.
B. 127.0.0.0/24 is the reserved loopback network and cannot be used for host networks.
C. 172.16.0.0/24 is the reserved multicast network and cannot be used for host networks.
D. 192.168.255.0/24 is not valid because 255 in the third octet cannot be used in the network portion of the IP address.
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