Fill the blank:When op timi singS EM campaigns,negative keywords_________ your ads from appearing when people search for things that aren’t relevant to your business.

Negative keywords are a crucial part of optimizing Search Engine Marketing (SEM) campaigns. They prevent your ads from showing for irrelevant search queries. For example, if you sell "men's shoes" and add "free" as a negative keyword, your ad won't appear when someone searches for "free men's shoes." This saves you money by avoiding clicks from users who aren't looking to purchase, improving your ad's relevance and overall campaign performance. "Secure" is incorrect because negative keywords don't secure ad appearances; they restrict them. "Increase the chance of" is incorrect because negative keywords decrease, rather than increase, the chance of your ads appearing for specific, unwanted searches.