Which two statements about the client-identifier in a DHCP pool are true? (Choose two.)

Which two statements about the client-identifier in a DHCP pool are true? (Choose two.)
A . It specifies a unique identifier that is used only for BOOTP requests.
B . It specifies a hardware address for the client
C . It is specified by appending 01 to the MAC address of a DHCP client
D . It requires that you specify the hardware protocol.
E . It specifies a unique identifier that is used only for DHCP requests.

Answer: C, E