问题：

[单选]

You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database named DB1 in the instance. The DB1 database contains the following stored procedure. (Line numbers are useded for reference only.) 
01 CREATE PROCEDURE Sales.Procedure1 
02 AS 
03 IF OBJECT_ID('Service.Table') IS NOT NULL 
04 DROP TABLE Service.Table; 
06 CREATE TABLE Service.Table ( 
07 Id int PRIMARY KEY CLUSTERED, 
08 Name varchar(100); 
09 ); 
11 ... 
12 
GOThe following exception is raised when a user tries to invoke Procedure1, "Msg 262, Level 14, State 1, Procedure Procedure1, Line 5 CREATE TABLE permission denied in database 'DB1'." You should grant the user access to execute Procedure1, you must assign only the required permissions.
 What action should you do perform?（）  

A . Between lines 01 and 02, you should insert the WITH EXECUTE AS 'dbo' clause. 
B . Between lines 01 and 02, you should insert the EXECUTE AS USER = 'dbo' statement. 
C . You should give the user the ALTER permission on the Service schema 
D . You should give the CREATE TABLE permission and permit the user to drop the Service.Table table.&e