When making a call to a Mobile and Remote Access client, what are the combinations of protocol on each of the different sections A-B-C?

Refer to the exhibit.

When making a call to a Mobile and Remote Access client, what are the combinations of protocol on each of the different sections A-B-C?
A . IP TCP/TLS (A) + SIP TCP/TLS (B) + SIP TLS (C)
B . SIP TCP/TLS (A) + SIP TCP/TLS (B) + SIP TCP/TLS (C)
C . SIP TLS (A) + SIP TLS (B) + SIP TLS (C)
D . SIP TCP/TLS (A) + SIP TLS (B) + SIP TLS (C)

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Answer: D