My iPhone 4s is on iOS 9.2.1. Can I update straight to 9.3.1?

My iPhone 4s is on iOS 9.2.1. Can I update straight to 9.3.1? - 1

Added (1). Apparently 9.3.1 update is 35 MB. I didn't upgrade to 9.3 because of the issues it had, but am not sure if I can go straight to 9.3.1 or if that would include along the way all the upgrades in 9.3. Please let me know! Couldn't find this through searching.

Yes, but skipping upgrades usually means the updates are bigger -- it's 35 MB for the mini updater from 9.3 to 9.3.1, but an upgrade from something else would use the full updater which is much larger.

Yes, if 3.1 is the latest release.

I don't see why not.