Nonrepudiation is the ability to prevent or deny the parties involved in an electronic transaction from disputing or rejecting the validity or authenticity of the transaction. Nonrepudiation ensures that the parties cannot claim that they did not send or receive the transaction, or that the transaction was altered or tampered with.
The tool that helps ensure compliance with a nonrepudiation policy requirement for electronic transactions is digital signatures, which are the electronic equivalents of handwritten signatures that are used to verify the identity and integrity of the sender and the content of the transaction. Digital signatures are generated by applying a cryptographic algorithm to the transaction, using the sender's private key, which is a secret and unique code that only the sender knows and possesses. The digital signature can be verified by the receiver or any third party, using the sender's public key, which is a code that is publicly available and corresponds to the sender's private key. The digital signature can prove that the transaction was sent by the sender, and that the transaction was not altered or tampered with during the transmission.
The other options are not the tools that help ensure compliance with a nonrepudiation policy requirement for electronic transactions, because they do not provide the same level of verification and validation that digital signatures provide, and they may not be sufficient or effective to prevent or deny the parties from disputing or rejecting the transaction.
Encrypted passwords are the passwords that are converted into a secret or unreadable form, using a cryptographic algorithm, to protect them from unauthorized access or disclosure. Encrypted passwords can help to ensure the confidentiality and security of the passwords, but they are not the tools that help ensure compliance with a nonrepudiation policy requirement for electronic transactions, because they do not verify the identity and integrity of the sender and the content of the transaction, and they may not prevent or deny the parties from disputing or rejecting the transaction.
One-time passwords are the passwords that are valid or usable for only one session or transaction, and that are randomly generated or derived from a dynamic factor, such as time, location, or device. One-time passwords can help to enhance the security and authentication of the parties involved in the transaction, but they are not the tools that help ensure compliance with a nonrepudiation policy requirement for electronic transactions, because they do not verify the identity and integrity of the sender and the content of the transaction, and they may not prevent or deny the parties from disputing or rejecting the transaction.
Digital certificates are the electronic documents that contain the information and credentials of the parties involved in the transaction, such as their name, public key, expirationdate, etc., and that are issued and signed by a trusted authority or entity, such as a certificate authority or a digital signature provider. Digital certificates can help to establish and confirm the identity and trustworthiness of the parties involved in the transaction, but they are not the tools that help ensure compliance with a nonrepudiation policy requirement for electronic transactions, because they do not verify the identity and integrity of the sender and the content of the transaction, and they may not prevent or deny the parties from disputing or rejecting the transaction. References = ISACA, CRISC Review Manual, 7th Edition, 2022, pp. 40-41, 47-48, 54-55, 58-59, 62-63 ISACA, CRISC Review Questions, Answers & Explanations Database, 2022, QID 197 CRISC Practice Quiz and Exam Prep

The percentage of unpatched DMZ servers is a critical KCI for preventing cyber risk events on external- facing infrastructure. Unpatched servers are vulnerable to exploitation, and monitoring this indicator helps ensure timely application of security updates, reducing the risk of successful attacks.
Reference:ISACA CRISC Review Manual, 7th Edition, Chapter 4: Information Technology and Security, Section: Key Control Indicators.

Embedding risk management into processes that are aligned with business drivers is the most effective way to integrate risk and compliance management, as it ensures that the risk management objectives and activities are consistent and supportive of the enterprise's strategic goals and values. It also enables the identification and management of risks and compliance requirements across the enterprise, and the optimization of risk and compliance resources and performance. Embedding risk management into compliance decision-making, designing corrective actions to improve risk response capabilities, and conducting regular self-assessments to verify compliance are not ways to integrate risk and compliance management, but rather components or outcomes of the risk and compliance management process. References = CRISC Practice Quiz and Exam Prep; CRISC: Certified in Risk & Information Systems Control Sample Questions, question 202.

Configuration updates are changes made to the settings, parameters, or components of an IT system or network. Configuration updates can affect the functionality, performance, security, and reliability of the system or network. Therefore, configuration updates should follow formal change control, which is a process that ensures that changes are authorized, documented, tested, and implemented in a controlled manner. Formal change control can help prevent errors, conflicts, disruptions, and vulnerabilities that may arise from configuration updates. Configuration updates that do not follow formal change control should be of greatest concern to a risk practitioner when determining the effectiveness of IT controls, as they can introduce newrisks or compromise existing controls. References = Risk and Information Systems Control Study Manual, Chapter 3: Risk Response and Mitigation, Section 3.5: Control Monitoring and Reporting, p. 161-
162.

In addition to the risk register, which is a tool to document and monitor the risks that affect the organization, a risk practitioner should review the business objectives of the organization to develop an understanding of its risk profile. The risk profile is a description of the set of risks that the organization faces in relation to its goals and strategies. By reviewing the business objectives, the risk practitioner can identify the sources, drivers, and consequences of the risks, as well as the alignment, prioritization, and tolerance of the risks. The business objectives also provide the context and criteria for evaluating and managing the risks. The other options are not the best choices to review for developing an understanding of the organization's risk profile, as they do not capture the full scope and nature of the risks. The control catalog is a list of the existing controls that are implemented to mitigate the risks, but it does not reflect the effectiveness, efficiency, or sufficiency of the controls. The asset profile is a description of the resources and capabilities that the organization possesses or relies on, but it does not indicate the value, vulnerability, or interdependency of the assets. The key risk indicators (KRIs) are metrics that measure the level and trend of the risks, but they do not explain the causes, impacts, or responses to the risks. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 2, Section 2.1.2, Page 49.