Which action typically indicates that a cell is currently active in a spreadsheet?

When a cell is currently active in a spreadsheet, it typically has highlighted borders, making it visually distinct from other cells. This indication helps users quickly identify where data entry or editing is taking place. The highlighted borders or a different color around the active cell signify that this is the focal point for actions such as entering formulas, modifying content, or applying formatting changes.

The other options do not typically signify an active cell. A grayed-out cell usually indicates that it is inactive or protected, an empty cell simply shows no data or content, and a cell containing comments may indicate additional information but does not serve as a clear visual cue of activity. Therefore, highlighted borders effectively communicate the active status of a cell within a spreadsheet context.