You have a DHCP&#819

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 receiveing IP addresses that are currently in use on the network. What should you do？（）

• AAdd the DHCP server option 15
• BAdd the DHCP server option 44
• CSet the Conflict Detection value to 0
• DSet the Conflict Detection value to 2