單項選擇題

A server failed Thursday evening before the nightly backup. The backup scheme in place was fullbackups 
every Sunday,incremental backups on Monday,Wednesday,and Friday,and differentialbackups on Tuesday,Thursday,and Saturday. 
To fully restore the server,which of the following is theLEAST amount of backup sets required?()

A. One
B. Two
C. Three
D. Four

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