Because you've set up your web data stream, your website is already feeding data to your Google Analytics property. You notice that enhanced measurement is enabled for the web data stream. What happens when this setting is enabled?
你已設定好網站的資料串流（web data stream），網站已經把資料送到你的 Google Analytics 資源。你注意到此資料串流啟用了「加強型評量（Enhanced Measurement）」。當這個設定啟用時，會發生什麼事？
(1) Events can be associated with signed-in users to enable cross-device reporting 事件（events）可與已登入使用者關聯，以啟用跨裝置報表
(2) Events from your mobile app can be combined with your existing website data 行動應用程式的事件可以與你現有的網站資料合併
(3) Conversion reporting for the web data stream uses machine learning to distributes credit across channels 此網站資料串流的轉換（conversion）報表會用機器學習在各通路間分配歸因
(4) Additional events are collected from your website without you needing to change your website's code 你無需更改網站程式碼，就會從網站自動收集更多事件
[解答]
答案是 : (4) Additional events are collected from your website without you needing to change your website's code 你無需更改網站程式碼，就會從網站自動收集更多事件
啟用「增強型評量（Enhanced Measurement）」後，GA4 會自動追蹤部分常見互動事件，例如頁面檢視、捲動、站內搜尋、外部連結點擊、檔案下載、影片互動等，無須額外修改網站的追蹤程式碼。其他選項分別屬於跨裝置身分拼接、App＋Web 整合或轉換歸因機制，與增強型評量的功能不相符。
