在所有 Google Ads 廣告活動中，哪種 AI 技術輔助解決方案涵蓋最多放送管道和廣告空間？

Performance Max campaigns are the correct answer because they are designed to leverage Google's AI across all Google Ads inventory and channels. This includes Search, Display, YouTube, Gmail, Discover, and Maps, providing the broadest reach for advertisers. Application campaigns are focused solely on driving app installs and engagement. Video campaigns are limited to YouTube and Google video partners. Search campaigns primarily target users on Google Search and its partners. While these campaigns utilize AI, their scope is narrower compared to Performance Max, which integrates and optimizes across all available channels for a unified campaign goal.