フリー問題

問題文

In an Enterprise 2.0 account with several business units, where is the All Subscribers list maintained?

選択肢

1. Each business unit has its own subscriber context, and the enterprise All Subscribers reflects subscribers across the hierarchy per the account model.
2. All Subscribers exists only in the child business units, never at the parent.
3. All Subscribers is stored in the Preference Center.
4. There is exactly one shared list of subscribers with a single global status per address for the whole account.