None
The security-related features, functions, mechanisms, services, procedures, and architectures implemented within organizational information systems or the environments in which those systems operate.
Source(s):
NIST SP 800-53 Rev. 4
under Security Functionality
The security-related features, functions, mechanisms, services, procedures, and architectures implemented within organizational systems or the environments in which those systems operate.
Source(s):
NIST SP 800-171 Rev. 1
[Superseded]