Which three of the following must be done to provide custom phone rings to your users?

Which three of the following must be done to provide custom phone rings to your users? (Choose three.)

A.
Create the ring as a wav file and copy to flash.

B.
Create a RingList.xml file using a text editor and copy to flash.

C.
Configure the tftp server to serve the ring and RingList.xml file.

D.
Reboot the phones.