the absolute easiest way to figure it out is get your VIN#, call a dealership and give them the VIN, they'll run a build sheet and tell you what it came with from factory. if you bought it used the previous could have swapped gears but being a 2017 I doubt someone would dump money into it to get rid of it already
You can jack it up, put it in neutral make a mark on the driveshaft rotate the rear tire one rotation and count how many times the shaft spins. 3 3/4 rotations = 3.73 gears.