As the chief mechanic at Fly Hi Airlines, Mack Wild's department is the only one that has the necessary skills to repair the airline's critical cockpit electronics. The senior managers all treat Mack with respect and try to avoid criticizing him or his department because they MOST LIKELY see Mack's department as ________.

Question

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The fact that Mack's department is the only one with the necessary skills to repair the critical cockpit electronics makes them irreplaceable. This is why the senior managers are respectful and avoid criticizing Mack or his department.

As the Chief Mechanic at Fly Hi Airlines, Mack Wild's