You have a DHCP server that runs Windows Server 2008. You restore the DHCP database by using a recent backup. You need to prevent DHCP clients from receiving IP addresses that are currently in use on the network. What should you do？（）

• A、Add the DHCP server option 15.
• B、Add the DHCP server option 44.
• C、Set the Conflict Detection value to 0.
• D、Set the Conflict Detection value to 2.