- Custom 1×1 pixel that fires when the product or service page loads
- Dynamic Floodlight tag that sources product or service IDs
- Sales Floodlight tags that capture revenue
- Custom Floodlight variable that captures the product or service ID
The correct answer is: Custom Floodlight variable that captures the product or service ID
Explanation: Build audience lists based upon specific custom Floodlight variables (such as a premium hotel room booking) and use display ads to upsell new product ranges and promotions. You can use custom Floodlight variables from your activity Data Transfer files across multiple activities to select the appropriate cookies to add to a list.
Read more here: https://support.google.com/campaignmanager/answer/3249446