What is a characteristic of a SIP endpoint configured in Cisco UCM with ’Use Trusted Relay Point’ set to "On’?

What is a characteristic of a SIP endpoint configured in Cisco UCM with ’Use Trusted Relay Point’ set to "On’?
A . It creates a trust relationship with the called party.
B. It enables the Use Trusted Relay Point setting from the associated common device configuration.
C. It enables Cisco UCM to insert an MTP or transcoder designated as a TRP.
D. If TRP is allocated and MTP is also required for the endpoint. calls fail.

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Answer: C