If the ADD DBPARTITIONNUM command is used to add a new database partition to an existing DB2 instance,which statement is correct? （）

• A、All existing databases in the instance are expanded to the new database partition but data cannot be stored on the newpartition until it has been added to a partition group.  
• B、Database partition groups within existing databases will automatically include the new database partition and willredistribute their existing data to the new partition.  
• C、Any single partition databases within the instance will automatically become multi-partition databases once the newpartition is added to the instance.  
• D、A database administrator would need to modify the db2nodes.cfg file to complete the addition of the new partition tothe instance.