Check boxes on spreasheet

I have three checkboxes on a spreadsheet, yes, no, unsure. I want to allow
the user to only click on one of these - how do i do that?

Option Buttons rather than checkboxes allow only one choice to be selected.
Clive

Originally Posted by Jas

I have three checkboxes on a spreadsheet, yes, no, unsure. I want to allow
the user to only click on one of these - how do i do that?