为自己加油

You issue the command:

SQL>ALTER DATABASE BACKUP CONTROLFILE TO TRACE;

Which statement is true about the command?

A.
It creates a copy of the control file and stores it in the location specified in the
Diagnostic_dest initialization parameter.
B.
It creates a file that contains SQL statement to re-create the control file.
C.
It updates the alert log file with the location and contents of the control file.
D.
It creates a binary backup of the control file.