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The of the following statements BEST describes the Definitive Media Library (DML)?

a secure library where definitive authorized versions of all software and back-ups are protected
a secure location where definitive hardware spares are held Leading the way in IT testing and certification tools, www.testking.com
a database that contains definitions of all media configuration items (CIs)
a secure library where definitive authorized versions of all media configuration items (CIs) are stored and protected