Hi, First time asking help for excel but not sure how to proceed with this.

I have a spreadsheet which a user should only select one option out of the first 5 columns for the row. an X is filled when a user clicks on the cell and is removed when the user clicks on that cell a second time.

what I need help with is a way that once a cell is filled the X needs to prevent the user from adding it to the other options on the row. But when the X is removed they can select any option again.

Kind regards

Lee