You administer a SQL Server 2008 infrastructure.
You administer two SQL Server 2008 instances named Instance1 and Instance2. Instance1 contains the Sales database, and Instance2 contains the Accounts database.
A procedure in the Sales database starts a transaction. The procedure then updates the Sales.dbo.Order table and the Accounts.dbo.OrderHistory table through a linked server.
You need to ensure that the transaction uses a two-phase commit.
What should you do?

A.
Configure the linked server to use distributed transactions.

B.
Configure a Service Broker to enable the appropriate transaction control.

C.
Ensure that the linked server is appropriately configured for delegation.

D.
Ensure that the linked server is appropriately configured for impersonation.