フリー問題

問題文

A bank needs a nightly audience of customers who hold a savings account and have not logged in for thirty days, built by combining three data extensions. Which activity produces that audience?

選択肢

1. An import activity writing its result into a target data extension, because it can join several sources and apply the conditions in one step.
2. A refresh group activity writing its result into a target data extension, because it can join several sources and apply the conditions in one step.
3. A query activity writing its result into a target data extension, because it can join several sources and apply the conditions in one step.
4. A filter activity writing its result into a target data extension, because it can join several sources and apply the conditions in one step.