After receiving several complaints from employees about a laser printer, you conclude that the most probable cause is a dirty drum. What is the MOST logical reason for this conclusion?

The most logical reason to conclude that a dirty drum is the cause of the printer issue is the presence of spots at regular intervals on the page. When the drum of a laser printer becomes contaminated with toner or other debris, it can create consistent patterns of spots, particularly if the contamination is unevenly distributed. This results in the same spots appearing repeatedly on subsequent prints, which aligns perfectly with the symptoms described.

In contrast, frequent paper jams may indicate issues with the paper feed system or the paper itself, rather than the state of the drum. Ghosting on prints, which refers to faint images or text appearing from previous prints, could indicate a problem with the imaging process or drum quality, but it does not specifically point to a dirty drum in the same clear way that spots do. Using incorrect paper type can lead to various other issues, such as poor print quality or feeding problems, but does not typically manifest as a repeating pattern of spots.

Therefore, seeing spots at regular intervals is a direct consequence of the drum's condition, making it the most logical conclusion to suspect a dirty drum as the underlying cause of the printing issues experienced by the employees.