A. ALTER DISKGROUP misc MOUNT;
B. ALTER DISKGROUP misc DROP DISK misc2;
C. ALTER DISKGROUP misc CHECK ALL NOREPAIR;
D. ALTER DISKGROUP misc RESIZE ALL SIZE 1023m;
E. ALTER DISKGROUP dgroupA ADD DISK '/devices/A*';

A. You can use RMAN stored scripts
B. Recovery is faster if data is stored in catalog in addition to the control file
C. You can store backup information of all registered databases in one place
D. Database backups are automatically deleted when they are older than the specified time period