You are managing four aircraft simultaneously. UAL22 is climbing through FL180, BAW5 needs a frequency change, DLH7 has requested descent, and AAL9 is awaiting push-back clearance. Which task should you address first?
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A
DLH7's descent request, as a conflicting aircraft may be at their requested level
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B
AAL9's push-back, since it is time-sensitive on the ground
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C
BAW5's frequency change, as the aircraft may have departed your sector
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D
UAL22's climb, since the aircraft is actively changing level