你正在製作應用程式廣告活動，現在必須考量廣告素材資源。在應用程式廣告活動中，每個廣告群組的 HTML、圖片及影片素材資源數量上限為何？

The correct answer is 20. Google Ads App campaigns allow for a maximum of 20 HTML5, image, and video assets per ad group. This limit provides advertisers with sufficient flexibility to test various creative combinations and optimize performance across different ad formats and placements. Options like 5, 8, or 10 are incorrect as they fall short of the actual limit, restricting the creative potential of the campaign. Having 20 assets enables a more robust testing environment, which is crucial for identifying the most effective ad creatives for app promotion.