You need to configure the required level of access to the SharePoint 2010 farm prior to the migration. What should you do?

ALTER DATABASE allows a SQL Server administrator to modify database properties and permissions, including adding login mappings and changing database access settings needed by the migration account. The command must run in the corporate farm because that is the source environment whose databases need to be made accessible to the migration process. Using the correct farm ensures permissions are granted on the actual data being migrated.

CONFIG DATABASE is not a valid Transact-SQL statement; no such command exists in SQL Server for configuring database access.

The product support farm is the destination, not the source; the access configuration must be applied in the corporate farm where the data resides.

Although ALTER DATABASE is the correct statement, running it in the product support farm targets the wrong environment and would not grant access to the corporate farm's databases that need to be migrated.