Consider the following scenario： You have a directory， data， under the disk group tdgroupA. You want to create an alias for one of the data files and you execute the following command： ALTER DISKGROUP tdgroupA  ADD ALIAS ’+tdgroupA/data/datafile.dbf’  FOR ’+tdgroupA.231.45678’；  Which task would be accomplished by the command？（）

• A、The command drops the file +tdgroupA·231.45678.
• B、The command physically relocates the file to +tdgroupA/data and renames the file to datafile.dbf.
• C、The command creates a copy of the +tdgroupA·231.45678 file and places it in +tdgroupA/data after renaming the file to datafile.dbf.
• D、The command creates an alias， datafile.dbf， and places it in +tdgroupA/data and does not remove the +tdgroupA·231.45678 file.
• E、The command creates a file， datafile.dbf， in +tdgroupA/data and removes the references for +tdgroupA·231.45678 from the data dictionary views.