单项选择题

下面哪些RMAN命令不能正确配置保留策略

A.CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 100 DAYS;
B.CONFIGURE RETENTION POLICY TO NONE;
C.CONFIGURE RETENTION POLICY TO REDUNDANCY WINDOW OF 2 DAYS;
D.CONFIGURE RETENTION POLICY TO REDUNDANCY 2:
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