What is true about librefs in SAS?

A libref, or library reference, serves as a pointer to a SAS library, allowing users to access and manage datasets and other resources within that library. This means that the first statement about a libref being a pointer to a SAS library is indeed accurate.

Librefs are considered global within a SAS session, meaning that once a libref is established in one part of a program, it can be utilized throughout that entire session, allowing for consistent access to the library it points to.

At the end of a SAS session, all librefs are automatically deassigned. This means that once the session concludes, the pointers are removed, and any temporary references to the datasets within that library are lost unless the library was designated as permanent.

Since all presented statements about librefs—being pointers, their global nature, and their deassignment at the end of a session—are true, the choice indicating all of the above is the correct response. This encapsulation demonstrates a comprehensive understanding of how librefs function within SAS environments.