You issued the following command on the temporary tablespace LMTEMP in your database：   SQL>ALTER TABLESPACE lmtemp SHRINK SPACE KEEP 20M；   Which requirement must be fulfilled for this command to succeed？（）  

• A、 The tablespace must be locally managed.
• B、 The tablespace must have only one temp file.
• C、 The tablespace must be made nondefault and offline.
• D、 The tablespace can remain as the default but must have no active sort operations.