A SharePoint 2010 environment contains a Microsoft SQL Server 2008 R2 database
instance named SP-SQL that hosts the databases for the farm. You are upgrading the farm
to SharePoint 2013. You need to ensure that users can access the unmodified farm contents
during the upgrade process. What should you do?

A.
Run the following Transact-SQL (T-SQL) statement for each content database and
service application you plan to upgrade. ALTER DATABASE <database name>SET
READ_ONLY;

B.
Run the following command-line tool for each site collection in the content databases you
plan to upgrade. Stsadm -o setsitelock -urKsite collection name> -lock readonly

C.
Run the following Windows PowerShell cmdlets for each web application in the
SharePoint 2010 farm you plan to upgrade. $db = Get-SPContentDatabase<web application
name> Set-SPContentDatabase$db -Status Offline

D.
Run the following Transact-SQL (T-SQL) statement for each content database and
service application you plan to upgrade. EXEC sp_dboption<database name>, “read only”, “True”;