What is the correct order of steps to install a new Cisco Unified IP Phone for a Unified Contact Center Enterprise agent in Unified Communications Manager 5.x?

A.
add device and device type, select model, enter the MAC address, and assign to device pool

B.
add peripheral and peripheral type, select model, and assign to device pool

C.
add phone, select model, enter the MAC address, and assign to device pool

D.
add agent, select model, enter the MAC address, and assign to device pool