单项选择题

Compressed backups work with which of the following commands？（）

A. copy as backup
B. backup as copy
C. backup
D. copy

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单项选择题
Consider the following command：  Backup database plus archivelog delete input；  How many backup sets would be created by this command if the following were true：（）  Control-file a NN uto backups were enabled.  NN The size of backup sets was not restricted.  NN One channel was allocated.

A. 1
B. 2
C. 3
D. 4
E. 5
单项选择题
WhattypeofbackupisstoredinaproprietaryRMANformat？（）

A. Backup set
B. Image copy
C. Backup section
D. Backup group
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