Which of the following properties of DHCP would Lisa, a technician, use to ensure an IP address is not leased out from the active scope?

Which of the following properties of DHCP would Lisa, a technician, use to ensure an IP address is not leased out from the active scope?

A.
Reservations

B.
Lease times

C.
Removing IPs from the active leases

D.
Configuring the DNS options