After a monthly change control board meeting at which the team determined the security impact of proposed changes to an application, what would be the team's next action? Response:

Preparing only the POA&M is incomplete; the security plan and SAR also need updates to reflect the change's impact on the overall security posture and assessment.

Preparing only the security assessment report is incomplete; the security plan and POA&M also need updates to reflect the change's impact on planned controls and identified mitigations.

After determining the security impact of proposed changes in a change control board meeting, the critical next step is to update the system's security documentation. This includes revising the security plan to reflect the new configuration or operational state, updating the security assessment report with any new findings or risks, and modifying the plan of action and milestones (POA&M) to address any newly identified vulnerabilities or needed mitigations resulting from the changes. This ensures all documentation remains current and accurate for ongoing risk management.

Assessing a subset of security controls is typically part of the 'Assess' step or ongoing monitoring, which would occur before or during the impact analysis, but not as the immediate next step after the change control board has determined the impact and needs to document it.