Where does an IP phone obtain the extension number and speed-dial settings from?

Where does an IP phone obtain the extension number and speed-dial settings from?

A.
the settings that are configured on the physical phone

B.
the registration file that the phone receives from the Cisco Unified Communications Manager

C.
the device and line configuration in Cisco Unified Communications Manager, during the registration process

D.
the default device profile that is configured in Cisco Unified Communications Manager