They define quality attributes such as performance scalability security usability and maintainability is the correct statement.

The correct option describes what system non functional requirements are. Non functional requirements express the quality attributes and constraints that govern how a system performs and behaves rather than what functions it implements. These attributes are used to set measurable targets for architecture decisions testing and acceptance criteria and they drive design choices around performance scalability security usability and maintainability.

They prescribe procedures to retire or decommission the application at its end of life is incorrect because retirement and decommissioning are operational lifecycle procedures. Those procedures belong to deployment and operational plans rather than to non functional requirements which describe quality attributes and constraints.

They dictate how the application should operate during external network outages and dependent system failures is incorrect because this wording implies runbooks and operational behavior. Non functional requirements may include availability and resilience goals but they do not typically prescribe exact operational steps for outage handling. Incident response and failover procedures are operational designs and runbook content that implement resilience goals.

They are satisfied by configuring platform controls such as Cloud IAM and VPC firewall rules is incorrect because platform controls are implementation choices that can help meet non functional requirements. Non functional requirements are requirements to be satisfied by architecture testing and controls and they are not themselves satisfied solely by configuring specific platform settings.

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