Force choice between columns

I tried searching the boards, but not sure that I'm asking the question the right way. Essentially, I'm looking to know the following:

Within the Smartsheet worksheet, I have two columns both set up in a checkbox format. I'd like to restrict my users from checking both accidentally as it should be an either/or scenario. Can I force the columns to only check one or the other? Or am I making this too complicated and it should just be one column with drop-down option?



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