Multi-select problem: How does the next paragraph end?

How to tell when blue cheese is bad
Smell the cheese.
The best way to tell if your blue cheese has spoiled is to smell it. Fresh blue cheese has a strong scent, but it changes as it starts to go bad.

Options: I. Give the cheese a sniff, and if it has an ammonia-like smell, it is probably spoiled. It's a good idea to give blue cheese a smell when you've just brought it home.; II. Fresh blue cheese starts tasting sour and stale. Fresh blue cheese doesn't smell as sweet as fresh green swiss because it tends to retain water.; III. As soon as you notice the odor, it will change. If the cheese has spoiled, take it out of the fridge.; IV. As the cheese gets worse, the scent changes. Usually, white cheddar cheese will smell bad in just a few minutes, but fresh cheeses will stay good for just a few days.;
I.