To provide hydraulic power to the stabilization system, what should the operator do?

The correct action to provide hydraulic power to the stabilization system is to move the selector valve to stabilization. This step is essential because the selector valve is responsible for directing hydraulic fluid to the stabilizers, thereby enabling them to deploy correctly. If the selector valve is not set to stabilization, the hydraulic system will not function as needed, and the stabilizers will remain inoperative, potentially compromising the aerial apparatus's stability during operations.

While other actions like lowering the stabilizers or adjusting the aerial ladder angle can be part of the overall stabilization process, they will not initiate the hydraulic power required for proper deployment. Activating the emergency brake, although necessary for safety, does not have any direct effect on the hydraulic system dedicated to stabilizing the apparatus. Thus, moving the selector valve to stabilization is critical to ensuring that the hydraulic power is appropriately directed and that the stabilization system operates effectively.