Multiple choice technology mainframe The primary means of managing storage in z/OS is Data Facility Storage Management Subsystem (DFSMS) Data Storage Facility Management Subsystem (DSFMS) Data Storage Facility Management System (DSFMS Data Facility Storage Management System (DFSMS) Reveal answer Fill a bubble to check yourself A Correct answer Explanation DFSMS (Data Facility Storage Management Subsystem) is z/OS's primary storage management tool, providing automated policy-based management of datasets and storage. The other options have incorrect acronym expansions or names.