HKLM\SYSTEM\CurrentControlSet\Services\Dhcp\Parameters\
The Options subkey in DHCP\Parameters stores configuration data for options that the client can request from the DHCP server by using DHCP Manager.
The Options subkey does not contain entries. Instead, it contains numbered subkeys, each of which represents a DHCP option. The entries in each <Option#> subkey apply only to the option represented by the subkey.