What combination of events should an engineer define for segmenting orders from a Facebook campaign?

To effectively segment orders from a Facebook campaign, the combination of events that includes "Page Visited = Facebook Landing Page" and "Checkout = True" is particularly insightful. This choice indicates a clear intent by the user: they have landed on the specific page designed for the Facebook campaign, which often includes targeted messaging or promotions, and have subsequently completed the checkout process. By aligning these two events, an engineer can accurately assess the effectiveness of the Facebook campaign in driving users through the purchase funnel.

This segmentation allows for a focused analysis on conversions stemming specifically from the campaign, helping marketers understand user behavior and gauge the overall performance of their advertising strategy. It also allows for optimization around the campaign's success in not just attracting traffic but converting it into actual sales.

In contrast, the other combinations do not effectively link the campaign source to the desired outcome of a completed order. For instance, simply tracking page visits to the checkout or any other combinations that fail to directly connect the landing page engagement with a completed checkout would not provide the necessary insights for assessing campaign success. Therefore, the chosen events in the correct answer provide the most direct measure of campaign effectiveness.