請問哪個 Chrome 和 Android Privacy Sandbox API 不必使用第三方 Cookie，就能評估廣告活動成效？

Attribution Reporting is the correct answer because it allows advertisers to measure conversions (like clicks or views leading to purchases) across sites without relying on third-party cookies. It uses on-device storage and privacy-preserving mechanisms to link ad interactions to conversions, providing aggregated reports rather than individual user data. First-Party Sets allow related domains owned by the same entity to be treated as first-party, which is about cookie management, not ad measurement. Protected Audience (formerly FLEDGE) is for remarketing and custom audience solutions. Topics is for interest-based advertising, categorizing user interests without individual tracking. While all are part of Privacy Sandbox, only Attribution Reporting directly addresses campaign performance measurement without third-party cookies.