What is the main function of a display column in reporting?

The primary function of a display column in reporting is to visually present specific information or data that is relevant to the user. In the context of this question, showing date information aligns closely with the purpose of display columns, as they often convey essential details that need to be viewed directly in the report for analysis and understanding.

In many reporting systems, display columns serve to highlight critical attributes or metrics. By focusing on date information, the display column enables users to see trends, monitor progress over time, and make informed decisions based on the temporal aspects of the data. Dates can indicate when events occurred, track durations, or help in scheduling, providing invaluable context in a report.

Other choices pertain to functions that are typically not associated with the main objective of display columns. Filtering, evaluating parameters, or identifying specific types of parameters are processes that often happen behind the scenes or are related to the logic of the report rather than the direct display of information. Therefore, the correct answer highlights the essential role of display columns in effectively communicating relevant information to users.