The______scheme in a database system is responsible for the detection of failures and for the restoration of the database to a state that existed before the occurrence of the failure．

A．query

B．test

C．check

D．Recovery

A．

B．

C．

D．

[单选题] The （74） scheme in a database system is responsible for the detection of failures and for the restoration of the database to a state that existed before the occurrence of the failure.（74）A． queryB． testC． checkD． recovery

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