On a sectional chart, what does the symbol of a tower with a number like 1549 (1249) represent?
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A
The obstacle's height is 1549 feet AGL and 1249 feet MSL.
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B
The obstacle is a group of towers with the tallest being 1549 feet MSL.
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C
The obstacle's top is at 1549 feet MSL, and its base is at 1249 feet MSL.
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D
The obstacle's top is at 1549 feet MSL, and its height is 1249 feet AGL.