A local retailer wants to measure the effectiveness of Facebook campaigns based on the number of in-store purchases after customers have been exposed to an ad within the platform.
Where should outcome data be sourced?
A . Third-party data sources as an estimation of real customers
B . First-party data such as email or phone number captured in-store
C . Coordinates from each of its regional shops
D . Data from the Facebook pixel in its site
Answer: D