EFIS approach mode adds which of the following elements to the standard instrument displays?

The correct answer highlights the specific elements that the EFIS (Electronic Flight Instrument System) approach mode integrates into standard instrument displays. In this mode, the system provides a glideslope, localizer, and marker beacon to aid pilots during approach and landing phases.

The glideslope element is crucial as it indicates the vertical descent angle required to reach the runway at the proper touchdown point, ensuring safe and precise landings. The localizer provides lateral guidance, helping the pilot align the aircraft with the centerline of the runway. The marker beacon serves as an additional navigational aid, indicating specific points along the approach path, such as the final approach fix.

This combination of information significantly enhances situational awareness during critical phases of flight, promoting safety and operational efficiency.

Other possible options include elements that might be beneficial in flight but do not directly pertain to the specific functions of the EFIS approach mode. For instance, while heading and altitude are important for general flight operations, they are not uniquely associated with the approach mode of EFIS. Thus, they would not accurately represent the enhanced capabilities provided by this mode.