You would like to create an RMAN recover catalog in which to store information about your DB01 database. You want to use the database named RCDB for the storage of your recovery catalog. The six steps you will follow to create a recover catalog are not displayed in the correct order. Which displays the correct order？（）
1. Grant the appropriate privileges （CONNECT and RESOURCE） and roles 
（RECOVERY_CATALOG_OWNER） to the user responsible for performing backup and recover operations. 
2. Register the target database in the catalog. 
3. Create the catalog using the RMAN command line interpreter. 
4. Create a user and schema which will own the recovery catalog. 
5. Create tablespace to hold the catalog in the database you have dedicated for your RMAN recovery catalog. 
6. Connect to the target database using SYSDBA privileges.

A.4，1，5，6，3，2
B.4，3，1，5，6，2
C.4，5，1，3，2，6
D.5，4，1，3，2，6
E.5，4，1，3，6，2