You have an Exchange Server 2013 organization that contains a database available group
(DAG) named DAG1. DAG1 contains three Mailbox servers named Server1, Server2, and
Server3. DAG1 contains a mailbox database copy named DB1. You implement a lagged
copy of DB1 on Server3. The copy lag time is seven days. You need to ensure that copies of
successfully processed email messages are stored on Server1 and Server2 for seven days.
What should you modify?

A.
The Shadow Redundancy settings

B.
The Safety Net settings

C.
The settings of DAG1

D.
The settings of DB1