Which Transact-SQL statement should you include at the beginning of the stored procedure?

You are writing a set of queries against a FILESTREAM-enabled database. You create a stored procedure that
will update multiple tables within a transaction. You need to ensure that if the stored procedure raises a run-time error, the entire transaction is terminated and rolled back. Which Transact-SQL statement should you
include at the beginning of the stored procedure?

A.
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE

B.
SET XACT_ABORT OFF

C.
SET TRANSACTION ISOLATION LEVEL SNAPSHOT

D.
SET IMPLICIT_TRANSACTIONS ON

E.
SET XACT_ABORT ON

F.
SET IMPLICIT TRANSACTIONS OFF

Explanation:
Verified answer as correct.
Reference: http://msdn.microsoft.com/en-us/library/ms188792.aspx