What key information is used by the authorizing official (AO) to assist with the risk determination of an information system (IS)? Response:

The Security Authorization Package (SAP) is a complete collection of documentation, including the security plan, security assessment report, and plan of action and milestones (POA&M), which provides the AO with all necessary evidence to evaluate the system's security posture and make an informed risk acceptance decision.

A Plan of Action and Milestones (POA&M) details remediation efforts for identified weaknesses but is only one component of the broader authorization package, not the full basis for the AO's risk determination.

The Security Plan (SP) outlines the system's security controls and requirements but is merely one part of the comprehensive authorization package and does not provide the complete risk picture by itself.

An Interconnection Security Agreement (ISA) pertains specifically to security requirements between interconnected systems and is not the primary, overarching document for an AO's holistic risk determination of an entire information system.