Who is Dalton's backup?

One of the storylines we'd been keeping an eye on this offseason for the Cincinnati Bengals has been the battle for the rights to back up Andy Dalton. Dalton has been remarkably durable during his first two NFL campaigns, and there's two ways to look at that: either he's doing all the right things (along with the team's medical staff) to stay healthy, or he's due for a significant injury that will keep him sidelined. Either way, the team does need to identify the player that will serve as his direct understudy this fall.