Answer: As per listed below:
Explanation: In Microsoft Excel, adding comments to a cell can be done through the "Review" tab of the Excel Ribbon. The "Review" tab is located in the main menu at the top of the Excel window and contains various tools for reviewing and editing the content of a worksheet. To add a comment to a cell, you can select the cell and then click on the "New Comment" button in the "Comments" section of the "Review" tab. This will open a text box where you can type your comment, which will be displayed when you hover over the cell with the mouse pointer.