In configuration management, what baseline configuration information MUST be maintained for each computer system?

In configuration management, what baseline configuration information MUST be maintained for each computer system?
A . Operating system and version, patch level, applications running, and versions.
B . List of system changes, test reports, and change approvals
C . Last vulnerability assessment report and initial risk assessment report
D . Date of last update, test report, and accreditation certificate

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Answer: A