Developing a risk treatment plan is the best way to facilitate the mitigation of identified gaps between current and desired risk environment states. A risk treatment plan is a document that outlines the actions and resources needed to implement the chosen risk response strategy for each risk scenario. A risk treatment plan should include the following elements:

Risk scenario description and risk ID

Risk owner and other stakeholders

Risk response strategy and objectives

Risk response actions and tasks

Resources, costs, and benefits

Roles and responsibilities

Timeline and milestones

Performance indicators and monitoring mechanisms

Contingency plans and triggers

A risk treatment plan helps to close the gaps between the current and desired risk environment states by providing a clear and comprehensive roadmap for risk mitigation. It also helps to ensure that the risk response actions are aligned with the organizational risk appetite, objectives, and priorities. A risk treatment plan also facilitates the communication, coordination, and collaboration among the risk owners and other stakeholders involved in the risk mitigation process.

The other options are not the best ways to facilitate the mitigation of identified gaps between current and desired risk environment states. Validating organizational risk appetite is an important step in establishing the risk criteria and thresholds for the risk assessment process, but it does not directly address the gaps between the current and desired risk environment states. Reviewing results of prior risk assessments can provide useful insights and lessons learned for the current risk assessment process, but it does not necessarily lead to the development and implementation of effective risk response actions. Including the current and desired states in the risk register can help to document and monitor the risk scenarios and their status, but it does not provide the details and guidance for risk mitigation. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 4: Risk Response, Section 4.2: Risk Treatment, p. 189-191.