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單項(xiàng)選擇題

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

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