【单选题】
A full backup is performed every Sunday and incremental backups are performed daily Monday through Saturday. <br /> How many tapes would be required to perform a full restore if a complete failure occurred on Thursday before the incremental backup？（）
A、 2
B、 3
C、 4
D、 5
查看正确答案
B、
C、Generate a proxy class with asynchronous methods and use it for the new clients.  D、Add a new endpoint to the service that uses a full-duplex binding and use it for the new clients.  
