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