(A) Items sold
(B) Custom variable
If your primary campaign goal is to drive new visitors to a new products page, then use the Unique Floodlight activity type.
This activity type lets you count unique site visitors to make sure you’re attracting new ones, not just returning visitors.
This question is from the Check Your Knowledge section of the “Gather search insights with Floodlight” lesson from the Build and Execute Campaigns in Search Ads 360 course.