You recently upgraded a SharePoint Server 2010 server farm to SharePoint Server 2013. The farm containsmany sites. The sites contain frequently updated content.
You need to ensure that users can perform demo upgrades of the sites. The solution must minimize the impact
on the users.
Which feature should you enable in Microsoft SQL Server?

A.
Database mirroring

B.
Log shipping

C.
AlwaysOn Availability Groups

D.
Snapshot

Explanation:
With log shipping, you back up the transaction logs from a primary database to a secondary database on a
separate instance of SQL Server.
Log shipping enables you to automatically send transaction log files for databases from a primary database
server instance to a secondary database server instance.
Configure log shipping in SharePoint 2013