A developer develops a workflow where the result should contain recipients from Country Canada with...

To ensure that the result contains only recipients from Canada who are over 18 years old, the developer should use theIntersectionactivity. Intersection activities in Adobe Campaign Classic are used to filter down to the subset of recipients that meet all criteria across multiple query activities.

In this case, the Intersection activity will combine the two queries (Canada region recipients andrecipients older than 18) and return only those recipients who satisfy both conditions—i.e., those who are over 18 and live in Canada. Using Union would result in all recipients matching either query, and Exclusion would remove one query result from the other, which is not appropriate for this scenario.