You are monitoring a frequency where six aircraft are active. Aircraft identifiers are: KLM712, BAW92, UAL5, EZY441, RYR88, DLH56. After five minutes, you are asked which aircraft called last. The skill being tested is:
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A
Sustained attention and sequential memory for radio communications
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B
Spatial reasoning about aircraft positions
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C
Numerical estimation of call frequency
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D
Processing speed for communication handoffs