フリー問題

問題文

A marketer created a data extension but cannot select it as the audience of an email send. What is the most likely reason?

選択肢

1. The data extension is not marked as sendable, so it lacks a send relationship to subscribers
2. Email sends can only use lists, never data extensions
3. The data extension has too few columns to send
4. The data extension must first be deleted and re-created daily, and this remains true no matter what constraints the situation places on it