This is a test of commonsense. Complete the next sentence:

How to determine whether a perfume is authentic
Know the seller.
Most counterfeit perfume purchases can be avoided by going to a reputable seller. There are a variety of outlets for perfume, and it's important to understand the benefits and dangers of each.
Department stores are always the safest way to buy perfume, as you have the advantage of being able to closely examine the bottle in its packaging and talking to the retail staff. This allows you to approach the staff if it's possibly a fake, and you are able to return the perfume if it's not authentic.