I think the reason for the numerous options is that there have been a few revisions to the tensioner design over the production run.
As a 2012 model, yours likely came out of the factory with a fixed tensioner and a stretch belt, with a second stretch belt just for the AC compressor.
This turned out to be problematic, and Volvo started fitting a sprung tensioner with a normal belt when they came up for a belt change.
The original set up on mine only lasted 50k miles before it started rattling, and I replaced it with a kit from Volvo which contained the belts and a new tensioner.
So depending on the mileage, and if someone has changed the set up on yours, will dictate what you have.
If it's original, I would recommend getting a tensioner and belt kit, part number 9487168. Or, if your lucky, some has already fitted the new tensioner, and you just need belt number 9487317 for the alternator and 30777417 for the AC compressor
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