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In what altitude structure is a transponder required when operating in controlled airspace?
| * | A) Above 10,000 feet MSL, excluding the airspace at and below 2,500 feet AGL. |
| | B) Above 12,500 feet MSL, excluding the airspace at and below 2,500 feet AGL. |
| | C) Above 14,500 feet MSL, excluding the airspace at and below 2,500 feet AGL. |
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