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Preenka works at an airport. There are red lines painted on the ground next to the runway. Preenka has been instructed that nobody can step or drive across a red line unless they request, and get specific permission from, the control tower. This is an example of a(n)______ control. (D1, L1.3.1) A. PhysicalB. AdministrativeC. CriticalD. Technical

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