What should you select as the column headings in a crosstab query?

In a crosstab query, the column headings typically represent the values or categories that you want to summarize across the dataset. Selecting the appropriate column headings helps structure the data in a way that facilitates analysis and comparisons.

In the context of the choices provided, "Days" is a logical selection for column headings in a crosstab query, especially if you're looking to analyze data by specific days of the week or time intervals. This option would allow you to display summary information such as totals or averages of other data grouped by each day, enabling insights into patterns or trends over time.

The other options do not serve this purpose effectively as column headings. For example, "Credits" might be a data field representing a numerical value but doesn’t categorize data in the same way as days would. Similarly, "DeptName" can be a useful field in a crosstab but is typically better suited as a row heading rather than as a column heading. "ScheduleByDepartment" seems more descriptive of a dataset or report rather than a specific category of data to be summarized in columns. Hence, "Days" stands out as the most appropriate choice for column headings in this scenario.