A technician is trying to pair a Touch 8 with a Cisco TelePresence SX20 endpoint, but the codec is not automatically listed in the touch panel. What are two possible reasons for this behavior?

A.	The codec firmware version is below version TC 6.1.
B.	The codec and the Touch 8 are on separate subnets.
C.	Pairing visibility mode is not active on the codec.
D.	The codec is not compatible with a Touch 8 device.
E.	The Touch 8 is connected via the second Ethernet port on the codec.