Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to tell when blue cheese is bad [title] Smell the cheese. [step] 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.

Ending1: Give the cheese a sniff, and if it has an ammonia-like smell, it is probably spoiled. [substeps] It's a good idea to give blue cheese a smell when you've just brought it home. Ending2: Fresh blue cheese starts tasting sour and stale. [substeps] Fresh blue cheese doesn't smell as sweet as fresh green swiss because it tends to retain water. Ending3: As soon as you notice the odor, it will change. If the cheese has spoiled, take it out of the fridge. Ending4: 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.

Answer format: ending1/ending2/ending3/ending4