Weekly backups of the system are done on Sundays, and daily backups are done the rest of the week. Which of following backup methods were used if the system crashes on Friday and only requires two backup sets to recover the system?（）
- A、Incremental and snapshot
- B、Full and differential
- C、Full and incremental
- D、Differential and incremental
正确答案:B
答案解析:有
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