问题：

[多选] Which three options are supported as address allocation mechanisms for DHCP on Cisco routers?（）

A . The IP address can be automatically assigned to a host.
B . The IP address can be assigned as a random hash value of the burned - in - address of the lowest - numbered LAN interface on the router.
C . The network administrator can assign a speci fic IP address to a specific host MAC address.
D . The IP address can be assigned from configured pools in a reverse lexicographical order.
E . The IP address can be assigned to a host for a limited time or until the host explicitly releases the address.
F . The IP address can be assigned to a host until the host usurps the assigned value using its own dynamic override mechanism.