Tailspin Toys wants to use a CPA metric to measure the effectiveness of its display advertising campaigns. What does “CPA" stand for?

The selected answer option, Cost per action, is correct because "CPA" stands for Cost per action. This metric is used to measure the cost associated with each specific action taken by a user in response to an ad, such as making a purchase, signing up for a newsletter, or downloading an app. For Tailspin Toys, using CPA would allow them to evaluate how much they are paying for each conversion or action driven by their display advertising campaigns. It is a valuable metric for advertisers focused on optimizing their campaigns to achieve specific goals, such as increasing sales or engagement, rather than just measuring clicks or impressions. The other options, like Cost per audience, Cost per ad, and Cost per analysis, do not correctly define the CPA metric in the context of advertising.