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. If you are performing a full backup each Friday to a single tape and a differential backup to a single tape on all other days of the week

. If you are performing a full backup each Friday to a single tape and a differential backup to a single tape on all other days of the week (including the weekend), what is the minimum number of tapes required to accommodate seven days worth of backups?
a. 2 b. 7 c. 8 d. 9

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