Which method is used to cancel a libref in SAS?

The method used to cancel a libref in SAS is indeed by using the clear option. When you want to release or free a library reference (libref) that you previously assigned, the libname statement can be followed by the CLEAR option. This effectively deregisters the libref and makes it unavailable for further use in the session.

The clear option essentially instructs SAS to remove the association between the libref name and the assigned library location, thus preventing any further access to the datasets or views under that libref during that SAS session. This is a key operation when managing libraries in SAS, ensuring that you can maintain clear organization and manage memory effectively.

Other methods mentioned do not properly address the cancellation of a libref. Renaming a libref simply changes its name without impacting the original libref's status. Deleting something from a library pertains to data management within the library but does not cancel or unregister the library reference itself. Using a reset command is not a standard method for handling librefs in SAS, which is why the clear option is the correct and most efficient approach for this task.