The correct option is Guide enterprise risk management choices for protecting the system and its data.

Deciding a system classification level assigns an impact or sensitivity level to the data and the system and that information directly drives risk management decisions. Classification determines which risk thresholds apply and it guides selection of control baselines and resource allocation for protection so organizations can prioritize safeguards that match the system impact.

Establish the system authorization boundary is incorrect because the authorization boundary is defined by system architecture and scoping decisions rather than by the classification alone. Classification helps inform what to protect inside the boundary but it does not by itself set the boundary.

Determine applicable compliance frameworks for the system is incorrect because compliance requirements are driven by laws, regulations, contracts, and business needs. Classification can influence which controls within a framework are required but it does not by itself decide which frameworks apply.

Identify the responsible system owner is incorrect because assigning ownership is an organizational governance action. Classification informs responsibilities and expectations but the owner is identified through policy and organizational roles rather than through the classification process.

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