Which two of these are characteristics of multicast music on hold? (Choose two.)

A.
It uses one-way RTP point-to-point.

B.
There is a single user per audio stream.

C.
Networks and devices have to support multicast.

D.
It decrements by port number for different audio sources.

E.
It uses the multicast group address 238.1.1.1 to 239.255.255.255.

F.
It uses the multicast group address 239.1.1.1 to 239.255.255.255.

G.
It uses service parameters to set the codec type or types that are used by conferencing
services

Explanation:
Explanation : In multicast scenario A& B is absolutely wrong. Cisco recommends using an IP

address in the range that is reserved for administratively controlled applications on private
networks (239.0.0.0 to 239.255.255.255)
Link : http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_5_1/ccmfeat/fsmoh.html
NotE. if this would have been a choose three question then G could be correct as well.
Cisco Unified Communications Manager Features and Services Guide for Cisco
Unified communications Manager Release 8.5(1), page-1002