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单项选择题 You are managing an Oracle Database 11g database. You want to take a backup on tape drives of the USERS tablespace that has a single data file of 900 MB. You have tape drives of 300 MB each. To accomplish the backup， you issued the following RMAN command： RMAN>BACKUP SECTION SIZE 300M TABLESPACE users； What configuration should be effected to accomplish faster and optimized backups by using the above command？（）: A、 The SBT channel must be configured， with the default parallelism setting for the SBT device set to 1; B、 The COMPATIBLE initialization parameter for the database instance must be set to at least 10.0; C、 The SBT channel must be configured， with the parallelism setting for the SBT device set to 3; D、 The SBT channel must be configured， with the MAXPIECESIZE set to 300 MB

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