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 Enterprise Edition instance. There is a database named DB1 in the instance. A backup of DB1 is performed every day. You have to minimize the size of the full database backup files of DB1. In the options below, which Transact-SQL statement should you use? （）

A. BACKUP DATABASE DB1 TO DISK = 't:\backups\db1.bak';
BACKUP DATABASE DB1 TO DISK = 't:\backups\db1.bak' WITH COMPRESSION;
C. BACKUP DATABASE DB1 TO DISK = 't:\backups\db1.bak' WITH DIFFERENTIAL;
D. BACKUP DATABASE DB1 TO DISK = 't:\backups\db1.bak' WITH COMPRESSION,DIFFERENTIAL