How are the alternate pitch trims controlled?

The alternate pitch trims are controlled by the autopilot in the aircraft systems. This feature is designed to optimize control and stability during flight by automatically adjusting the pitch trim, ensuring better handling and performance. The autopilot utilizes sensors and data from various aircraft systems to make these adjustments, allowing for a smoother flight experience without requiring continuous input from the pilot.

The other choices may not align with standard operating procedures or system functionalities. Manual control by the pilot typically pertains to primary flight controls rather than automated systems like pitch trimming managed by the autopilot. Meanwhile, a separate switch or a specific flap control switch would not typically be involved in the management of pitch trim; these systems serve different functions related to flight control and configuration.