Execute the Respond step per NIST SP 800-39 Chapter 3 Section 3.3. Risk response includes (a) identifying alternative courses of action for responding to risk (accept + avoid + mitigate + share + transfer per Section 2.5.2), (b) evaluating alternatives against the risk frame and assessment outputs, (c) deciding on the appropriate response considering cost + effectiveness + acceptability + feasibility, (d) implementing the selected response by mapping to controls per NIST SP 800-53 + organisational change + contractual mechanisms + insurance + service-level agreements as appropriate, (e) documenting and communicating risk decisions with rationale to affected stakeholders at each tier. Risk sharing and transfer arrangements (Section 2.5.2.4) must be explicitly evaluated for supply chain risk per NIST SP 800-161 and other sharing relationships.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.