My 1099-B does not include short-term/long-term basis. (though it does say shares are non-covered). What do I enter for Sales Section dropbox for form 1099-B?

I have some RSUs that just vested. While I kept the actual vested shares, some were sold off in Sale to Cover in order to meet tax obligations by the broker. I got a 1099-B detailing the sale of the shares used to meet tax obligations. These were sold as soon as the award vested. The form it doesn't state long/short term. What do I put in the Sales section dropdown?