On a street map, a firefighter needs to find the quickest route to an incident at grid coordinate D-4. Grid columns run A–F (left to right) and rows run 1–6 (top to bottom). Where is D-4 located?
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A
Upper-left quadrant of the map
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B
Lower-right quadrant of the map
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C
Center-right area of the map
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D
Upper-right corner of the map