单选题You performed the RMAN database backup having a backupset key number 231 with the KEEP FOREVER option. After some days, you want to change the status of the database backup and you issued the following command: RMANCHANGE BACKUPSET 231 NOKEEP; What is the implication of this command?（）AThe backup is deleted.BThe backup is marked unavailable.CThe backup overrides the backup retention policy.Dthe backup becomes eligible for deletion according to the existing retention policy
单选题
You performed the RMAN database backup having a backupset key number 231 with the KEEP FOREVER option. After some days, you want to change the status of the database backup and you issued the following command: RMAN>CHANGE BACKUPSET 231 NOKEEP; What is the implication of this command?（）
A
The backup is deleted.
B
The backup is marked unavailable.
C
The backup overrides the backup retention policy.
D
the backup becomes eligible for deletion according to the existing retention policy
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