Which MRGL and Audio Source are played to Phone A?

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Refer to the exhibit.

There is a call flow between Phone A and Phone B Phone B (holder) places Phone A (holder) on hold.

Which MRGL and Audio Source are played to Phone A?
A . MRGL A and Audio Source 4
B . MRGL B and Audio Source 4
C . MRGL B and Audio Source 2
D . MRGL A and Audio Source 2

Answer: C