下面哪一项是使用增强型转化的必要条件？

Enhanced conversions require Google Ads conversion tracking as the conversion source because they build upon this existing framework. Enhanced conversions work by securely hashing and matching customer-provided data (like email addresses) from your website with signed-in Google accounts, which then attributes conversions more accurately to your Google Ads campaigns. Without Google Ads conversion tracking in place, there's no foundation for enhanced conversions to operate on. Using Google Display Ads or DV360 is an advertising platform choice, not a prerequisite for enhanced conversions. While email addresses and phone numbers are used for matching, they are not strictly "required" in the sense that other data (like full name and address) can also be used, and the core requirement is the Google Ads tracking itself. Similarly, using Google Analytics or offline conversions as the source is an alternative conversion measurement method, not a prerequisite for enhanced conversions.