• create a different ad for each keyword
• create multiple ads for each keyword
• only create one ad that’s relevant to all keywords
• create ads that are relevant to all keywords

The correct answer is: create ads that are relevant to all keywords

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Explanation: Grouping similar keyword together is a good practice to build a search campaign. This practice would allow you to create relevant ads for the particular group of keywords. In Google Ads, “relevance” refers to how useful your information is to your customer’s search. When determining relevance, Google look at several things within your account, including your keywords, ads, and landing page, and Google consider how closely related they are to someone’s search term.

Read more here: https://support.google.com/google-ads/answer/1722089