When Phone B places Phone A on hold which audio stream will be heard and from which server will it be delivered?

Refer to the exhibit. When Phone B places Phone A on hold which audio stream will be heard and from which server will it be delivered? (Choose two.)
Exhibit:

A. Audio 1
B. Server A
C. Server B
D. Audio 4
E. Audio 2
F. Audio 3
G. No audio will be delivered