单选题Consider this RMAN command： RMAN CONFIGURE RETENTION POLICY CLEAR； What is the effect of this command？（）ABackups will never expire.BIt removes any retention policy.CThe DELETE OBSOLETE command will fail with an error.DIt sets the retention policy to the default of REDUNDANCY 1.
单选题
Consider this RMAN command： RMAN> CONFIGURE RETENTION POLICY CLEAR； What is the effect of this command？（）
A
Backups will never expire.
B
It removes any retention policy.
C
The DELETE OBSOLETE command will fail with an error.
D
It sets the retention policy to the default of REDUNDANCY 1.
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