问题：

[单选] Your database runs in NOARCHIVELOG mode， and is backed up every night using RMAN scripts. However， last night your assistant DBA performed a manual operating system backup， instead of running the scripts. Today your database crashed and you now want to use the backups from last night. What do you need todo？（）

A . You need to perform the restore and recover operations manually, because the backup was made manually. 
B . First you need to resynchronize the catalog with the control file, and then you can use RMAN to recover the database. 
C . First you need to add the backup to the catalog using the CATALOG command, and then you can use RMAN to recover the database. 
D . You can just use RMAN and recover the database, because RMAN automatically updates the catalog with the backup information.&e