Using cloud-based backup tominimize the impactof a potential data loss event is a classic example ofrisk mitigation, which involves reducing risk to an acceptable level through proactive controls.
Reference:CRISC Manual - Domain 3, Slide 304-307

* A risk register is a document that records and tracks the information about the risks that may affect the organization's objectives, such as the risk description, category, source, cause, impact, probability, status, owner, response, etc.
* When developing a new risk register, a risk practitioner should focus on risk identification. This is the process of finding, recognizing, and describing the risks that may affect the organization's objectives, using various techniques, such as brainstorming, interviews, checklists, surveys, etc.
* Risk identification helps to create a comprehensive and accurate list of the risks that need to be managed, and to provide the basis for the subsequent risk analysis and evaluation, risk response planning, and risk monitoring and control.
* The other options are not the risk management activities that a risk practitioner should focus on when developing a new risk register. They are either subsequent or parallel to risk identification.
The references for this answer are:
* Risk IT Framework, page 29
* Information Technology & Security, page 23
* Risk Scenarios Starter Pack, page 21

The most important consideration when identifying stakeholders to review risk scenarios developed by a risk analyst is that the reviewers are accountable for the affected processes. This is because the reviewers need to have a clear understanding of the business processes that are exposed to the risks, and the potential impact and consequences of the risk scenarios. The reviewers also need to have the authority and responsibility to implement the risk responses and monitor the risk performance. By involving the stakeholders who are accountable for the affected processes, the risk analyst can ensure that the risk scenarios are realistic, relevant, and comprehensive, and that the risk management process is aligned with the business objectives and expectations. The other options are not as important as the accountability for the affected processes, because they do not guarantee that the reviewers have the necessary knowledge, experience, and involvement in the risk management process, as explained below:
B: Members of senior management are not the most important consideration, because they may not have the detailed or operational knowledge of the business processes that are exposed to the risks, or the technical or practical aspects of the risk scenarios. Senior management may also have different or conflicting priorities or perspectives on the risk management process, which may affect the quality and validity of the review.
C: Authorized to select risk mitigation options are not the most important consideration, because they may not have the direct or regular involvement in the business processes that are exposed to the risks, or the specific or contextual understanding of the risk scenarios. The authority to select risk mitigation options may also depend on other factors, such as the risk appetite, the budget, or the organizational structure, which may limit or influence the review.
D: Independent from the business operations are not the most important consideration, because they may not have the sufficient or relevant knowledge of the business processes that are exposed to the risks, or the potential or actual impact and consequences of the risk scenarios. The independence from the business operations may also create a gap or disconnect between the risk management process and the business objectives and expectations, which may affect the effectiveness and efficiency of the review. References = Risk and Information Systems Control Study Manual, Chapter 2, Section 2.3.1, page 45. A Stakeholder Approach to Risk Management, Module 2. Project risk management: stakeholders' risks and the project manager's role, What Is Risk Management Scenario Analysis?

Cost-benefit analysis is the most helpful tool to show risk reduction based on when developing risk treatment alternatives for a business case, because it compares the expected costs and benefits of each alternative and helps to select the most optimal and feasible one. Cost-benefit analysis also helps to justify the investment and resources required for the risk treatment plan and to demonstrate the value and return of the risk reduction.
The other options are not the most helpful tools, although they may also be considered when developing risk treatment alternatives. Risk appetite, regulatory guidelines, and control efficiency are examples of factors or criteria that influence the selection of risk treatment alternatives, but they do not show the risk reduction based on the alternatives. References = CRISC: Certified in Risk & Information Systems Control Sample Questions

Authentication logs are records of the attempts and results of logging into an IT system, network, or application, such as the user name, password, date, time, location, or device1. Authentication logs can help to verify and audit the identity and access of the users, and to detect and investigate any unauthorized or suspicious login activities, such as failed or repeated attempts, or unusual patterns or locations2.
Among the four options given, the discovery that authentication logs have been disabled should be of greatest concern to the organization. This is because disabling authentication logs can:
Prevent or hinder the organization from monitoring and controlling the access and activity of the users, especially the disgruntled, terminated IT administrator who may have malicious intentions or insider knowledge Enable or facilitate the disgruntled, terminated IT administrator or other attackers to bypass or compromise the authentication mechanisms or policies, and gain unauthorized or elevated access to the IT systems, networks, or applications Conceal or erase the evidence or traces of the login attempts or actions of the disgruntled, terminated IT administrator or other attackers, and make it difficult or impossible to identify, investigate, or prosecute them Indicate or imply that the disgruntled, terminated IT administrator or other attackers have already breached or compromised the IT systems, networks, or applications, and have disabled the authentication logs to cover their tracks or avoid detection3 References = What is Authentication Logging?, Authentication Logging - Wikipedia, Fired admin cripples former employer's network using old credentials