Any area or space for which the organization has confidence that the physical and procedural protections provided are sufficient to meet the requirements established for protecting the information or system.
Sources:
NIST SP 800-171r3
Any area or space for which an organization has confidence that the physical and procedural protections provided are sufficient to meet the requirements established for protecting the information and/or information system.
Sources:
NIST SP 800-53 Rev. 5