What type of rudder input requires mechanical operation and does not involve computers?

The correct choice refers to direct rudder pedal inputs, which are a direct mechanical operation controlled by the pilot. In this scenario, the rudder is operated through a traditional cable system or hydraulic system without any computer intervention. This means that the pilot's physical movement of the rudder pedals translates directly into rudder movement, allowing for precise control of the aircraft's yaw.

The other options involve some form of automated adjustment or computer interaction. Automatic rudder adjustments, for instance, are handled by the aircraft’s flight control computers to optimize performance or assist in maintaining stability without pilot input. Flaps and slats inputs are also controlled by systems that involve hydraulics and electronics, which work in conjunction with computer systems to manage lift and drag. Similarly, autopilot corrections are automated, relying on sensors and computer algorithms to adjust the aircraft’s flight path without the need for direct pilot input.