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Your database operates in ARCHIVELOG mode. User­managed consistent backups are performed every Sunday night. 
On Tuesday， client A drops a table at 8：00 a.m. as follows： 
SQL> DROP TABLE cust_ord PURGE; 
Table dropped. 
Client B executes a query at 9：00 a.m. on the same table as follows： 
SQL> SELECT * FROM cust_ord;
SELECT * FROM cust_ord
* 
ERROR at line 1： 
ORA­00942： table or view does not exist 
Client B needs the dropped table and reports the problem to you. With reference to this scenario， which action should you take？（）

You are connected to Recovery Manager （RMAN） without a recovery catalog. There is no copy of the control file available. You want to restore the control file from an autobackup. To retrieve the autobackup，you need the database ID （DBID）. 
In which two sources would you find the DBID？ （）