问题:
Refer to the exhibit. Which option correctly describes the order of signaling and call processing events when a branch employee calls headquarters?()
A . P,S,T,U
B . U,T,S,P
C . S,U,P,T
D . P,U,S,T
E . S,P,U,T
F . S,P,T,U
Refer to the exhibit. Which option correctly describes the order of signaling and call processing events when a branch employee calls headquarters?()
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