A marketer wants to know what keyword match type gives Smart Bidding the most data and flexibility to compete in the right auctions. Which of the following keyword match types would they choose?

Broad match provides Smart Bidding with the most data and flexibility because it allows ads to show for a wide range of relevant searches, including variations, synonyms, and related queries. This expansive reach generates more conversion data for Smart Bidding algorithms to learn from and optimize bids more effectively. Exact match is too restrictive, limiting data and flexibility to only precise keyword searches. Phrase match offers more flexibility than exact but less than broad, still limiting the scope of relevant searches. Negative match prevents ads from showing for specified terms, which is important for refining targeting but does not contribute to data volume or flexibility for Smart Bidding in the same way broad match does.