Which of the following descriptions is correct?

Which of the following descriptions is correct?
A . There are default bearers and dedicated bearers in LT
B . Voices for VoIP must use dedicated bearers.
C . If the user’s default APN is signed as the IMS APN in the HSS, the data APN is non-default, which will cause the user to activate the first default bearer with IMSIPN in all scenarios.
D . In the Attach request, the UE will report the LTE voice capability (whether CSFB or VoIP is supported) to the MM
F . The attach type initiated by the VoLTE user is EPS-attach, and the attach type initiated by the CSFB user is combined attach.

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Answer: C