What occurs to the cabin altitude without alerts during high elevation mode?

The cabin altitude reaching above 12,000 feet in high elevation mode is a suitable answer because, in this mode, the aircraft is designed to accommodate changes in external atmospheric pressure that occur at higher altitudes. The systems within the aircraft adjust to maintain cabin pressure relative to the external environment, which can result in cabin altitude exceeding 12,000 feet, especially if proper precautions and alerts are not triggered.

In high elevation mode, the aircraft may not actively manage cabin altitude below this threshold if no alerts are generated, allowing the cabin environment to stabilize at a higher altitude. Understanding this aspect is critical for ensuring that cabin pressure remains within safe operating limits and knowing when corrective actions need to be taken if altitude boundaries are exceeded.

Other choices involve constraints on cabin altitude, but none accurately reflect the potential for cabin altitude to exceed 12,000 feet under these specific conditions.