What type of data would typically be displayed on the EADI during approach mode?

The EADI, or Electronic Attitude Director Indicator, is designed to provide critical flight information during various phases of flight, particularly during approach mode. In this context, glideslope guidance and marker beacons are essential for pilots as they indicate whether the aircraft is on the correct path to landing, ensuring that the descent is on track.

Glideslope guidance offers visual cues that help pilots maintain the correct angle of descent towards the runway. This is vital for achieving a safe landing as it assists in aligning the aircraft with the runway approach. Marker beacons provide additional context by notifying pilots of specific geographic points along the approach path, which can be crucial for ensuring that altitude requirements are met at various points during the descent.

While flight path information, vertical speed, heading, and speed and altitude readings are also important elements in different phases of flight or on other instruments, they do not specifically convey the critical landing guidance provided by glideslope and marker beacon information during the approach. This makes the option referring to glideslope guidance and marker beacons the most relevant and accurate for the data displayed on the EADI during approach mode.