Those options have already been picked up. It’s a weird thing about the rookie FRP contract. First two years are absolutely guaranteed. After year one, you have to decide on the year three option, and after year two, you have to decide on the year four option. Off the top of my head, I can only think of two players who didn’t get the four years from the Spurs: James Anderson, who broke his fifth metatarsal, and Josh Primo, who broke his zipper.
Edit: upon further review, big man washouts Ian Mahinmi and Livio Jean-Charles got 3 and 2 years, respectively. They were non-optioned after year 2 and year 1, respectively. Mahinmi, likely a lot of others who didn’t stick in SA, carved out a career afterwards, 618 games in his case. Livio, not so much after that injury.