A full backup is performed every Sunday and incremental backups are performed daily Monday through Saturday. How many tapes would be required to perform a full restore if a complete failure occurred o

Two tapes would only cover the full backup and one incremental backup, which is insufficient to restore all data up to Wednesday.

Three tapes would be missing data from either Tuesday or Wednesday's incremental backup, leading to an incomplete restore.

A full restore requires the last full backup (Sunday's tape) and all subsequent incremental backups up to the point of failure. This includes Monday's, Tuesday's, and Wednesday's incremental backups, totaling four tapes.

Five tapes would imply needing Thursday's incremental, which had not yet occurred at the time of failure, or an unnecessary additional tape.