Which column can be sorted to group all notes written by physicians?

The correct choice is the column that identifies the "Author Type." This column specifically categorizes the individuals who have contributed to the notes, distinguishing between various author roles such as physicians, nurses, or other healthcare professionals. By sorting this column, it becomes easy to filter and view all notes authored by physicians, as the classification is explicitly defined.

Sorting by "Note Date" would organize the notes chronologically but would not provide the capability to group them by author type. The "Patient Name" column would focus on individual patients rather than their respective physicians, making it ineffective for this purpose. Lastly, "Procedure Type" categorizes the notes based on the medical procedures performed, which doesn't correlate with the author’s profession. Therefore, sorting by "Author Type" is the most effective method to group notes specifically written by physicians.