You have a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). You perform a normal backup of Server1 every Saturday. You need to implement a backup strategy for Server1 to meet the following requirements: ·Minimize the time required to restore files. ·On weekdays, back up only files that have changed since the Saturday backup. Which type of backup should you perform on weekdays?（）

• A、copy
• B、daily
• C、differential
• D、incremental