（单选题）
Every Sunday the Unix system administrator has a job that executes a full backup of the entire Unix system your database is on. Is this backup usable for backup and recovery of your database？（）
A Yes， if the database is in ARCHIVELOG mode
B Yes， if the database is in NOARCHIVELOG mode
C No， the backup is not usable in any way
D Only if the ENABLE_ONLINE_BACKUP parameter is set to TRUE
正确答案
答案解析
略
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