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.