How do negative keywords assist a Search campaign?

They can help eliminate the possibility of customers writing unfavorable reviews about a particular business.
They prevent ads from being delivered for searches that might otherwise qualify but most likely don’t match the intent of the search.
They give marketers insight into what other searches customers are using to arrive at their business.
They allow marketers to add negative keywords as a means of limiting the terms competitors can bid on at auction.

The correct answer is:

They prevent ads from being delivered for searches that might otherwise qualify but most likely don’t match the intent of the search.