The organization’s risk tolerance should be defined and approved by the board of directors, as they are the highest governing body of the organization and have the ultimate responsibility and accountability for the strategic direction and oversight of the risk management process. The board of directors should establish and communicate the risk appetite and tolerance of the organization, and ensure that they are aligned with the organization’s vision, mission, values, and goals. The board of directors should also monitor and review the risk management performance and outcomes, and provide guidance and support to the management and staff. The other options are not the correct answers, as they do not have the authority or responsibility to define and approve the organization’s risk tolerance, although they may have some roles or involvement in the risk management process. The chief risk officer (CRO) is the senior executive who leads and coordinates the risk management activities across the organization, and reports to the board of directors and the chief executive officer (CEO). The CRO should advise and assist the board of directors in defining and approving the risk tolerance, but they cannot do it on their own. The chief executive officer (CEO) is thehighest-ranking manager of the organization and has the responsibility and accountability for the execution and implementation of the risk management process. The CEO should support and communicate the risk tolerance defined and approved by the board of directors, but they cannot do it on their own. The chief information officer (CIO) is the senior executive who oversees and manages the information and technology functions and resources of the organization. The CIO should ensure that the IT risks and controls are aligned with the risk tolerance defined and approved by the board of directors, but they cannot do it on their own. References = Risk and Information Systems Control Study Manual, Chapter 1: IT Risk Identification, page 24.