Google Analytics 的哪項功能仰賴 Google AI 和機器學習技術，來評估無法直接觀察得知的轉換情形？

The correct answer is "重要事件模擬功能可評估轉換情形" (Key event modeling can assess conversions). This refers to Google Analytics's conversion modeling feature. Conversion modeling uses Google AI and machine learning to estimate conversions that cannot be directly observed due to privacy restrictions (like cookie consent or limited device identifiers). It fills in gaps in data to provide a more complete picture of conversion performance. "轉換事件功能可評估轉換情形" (Conversion event functionality can assess conversions) is too broad; while conversion events are tracked, this option doesn't specifically address the AI/ML aspect of unobservable conversions. "轉換回溯期功能可評估轉換情形" (Conversion lookback window functionality can assess conversions) defines the timeframe for attributing conversions, not the modeling of unobservable ones. "歸因路徑功能可評估轉換情形" (Attribution path functionality can assess conversions) focuses on the sequence of touchpoints leading to a conversion, not the estimation of missing data.