What is the correct sequence to follow when configuring CallManager?

A.
Services/Devices, Route Plan, Gateways, System

B.
System, Services/Devices, Route Plan, Gateways

C.
System, Route Plan, Services/Device, Gateways

D.
System, Gateways, Route Plan, Services/Devices

E.
Services/Devices, System, Route Plan, Gateways

F.
There is no recommendation concerning the flow of configuring CallManager.