You have a publicly registered domain name and class 2 block of IP addresses.

You're running your own DNS server. Part of the network will be accessible over the Internet and part will be private for the next six months. Then the whole network will be publicly available. What should you do to keep these areas separate for now and make the transition as easy as possible?

a. Assign valid IP addresses to the public parts of the network and nonroutable IP addresses to the private parts. Reassign IP addresses in six months.

b. You must have two separate DNS servers running on separate subnets. In six months, append the zone files together on the public DNS server.

c. Create zone files for the public and private parts of the network and keep them separated using a firewall. Use routable IP addresses for both zones.

In six months, change the appropriate zone from private to public while retaining the originally assigned IP addresses.

d. Make all IP addresses public, but use DHCP to randomly assign the private addresses.