A data custodian is responsible for which of the following?

The role of a data custodian is primarily focused on the technical aspects of managing an organization's data. This includes ensuring the safe custody, transport, and storage of data, which involves physical and logical protections to prevent unauthorized access while maintaining data integrity and availability. Additionally, data custodians are responsible for the implementation of business rules, including policies for data handling and compliance with relevant regulations.

Data custodians work closely with data owners to ensure that data is managed according to the organization's policies and standard practices. Their responsibilities typically extend to the management of various technical controls, such as encryption, backups, and data lifecycle management, to safeguard data throughout its lifecycle.

In contrast, other roles or concepts listed may relate to the broader context or usage of data but do not encapsulate the full scope of the responsibilities that define a data custodian's role within an organization. For instance, while logging access and alerts are critical for security, it represents a narrower function that falls under security monitoring rather than the comprehensive custodial duties regarding data handling and management.