You administer an Oracle Database 10g and a third-party database. You use Recovery Manager （RMAN） to perform backup and recovery operations. You have configured a recovery catalog to act as an RMAN repository. To which of the following databases can you NOT connect using the RMAN CONNECT command？（）

• A、 target database
• B、 auxiliary database
• C、 third-party database
• D、 recovery catalog database