Which two of these describe how media resources and audio streams operate with Cisco Unified Communications Manager?

Which two of these describe how media resources and audio streams operate with Cisco Unified Communications Manager? (Choose two.)

A.
Audio streams are terminated differently depending on the signaling protocol, such as SCCP or SIP.

B.
All media resources register with Cisco Unified Communications Manager.

C.
Signaling between Cisco Unified Communications Manager and hardware media resources uses the same protocol as the call-signaling type

D.
Audio streams are always terminated by media resources.

E.
There are no situations in which IP phone-to-IP phone audio streams will go directly between endpoints.

Explanation:
Incorrect Answer : ACE
Explanation : Cisco Unified Communications Manager Administration allows definition of at least

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Cisco 642-447 Exam

500 media resource groups per cluster. Each media resource group may include any combination of at least 20 media resources, including music on hold servers, media termination points, transcoders, and conference devices. Music on hold servers in one cluster support at least 10,000 simultaneous music on hold streams
Link : http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_0_2/ccmfeat/fsmoh.html Reference : Cisco Unified Communications Manager Features and Services Guide, Release 8.5(1), page-1001