单项选择题
A technician is dispatched to a location. While working, the technician’s cell phone rings. Which of the following actions should the technician take?（）
A. Answer the call to determine its importance.
B. Ignore the call and return the call from a land line.
C. Answer the call and leave the location in order to talk.
D. Silence the phone and allow the call to go to voice mail.
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