Laws and regulations provide the most useful input to determine the organization's information security strategy because they define the legal and compliance requirements and obligations that the organization must adhere to, and guide the development and implementation of the security policies and controls that support them. Security budget is not a useful input to determine the organization's information security strategy because it does not reflect the organization's security needs or goals, but rather a resource to enable the security activities and initiatives. Risk register is not a useful input to determine the organization's information security strategy because it does not reflect the organization's security vision or mission, but rather a tool to identify and manage the security risks. Risk score is not a useful input to determine the organization's information security strategy because it does not reflect the organization's security priorities or objectives, but rather a measure of the level of risk exposure or performance. References: https://www.isaca.
org/resources/isaca-journal/issues/2016/volume-4/technical-security-standards-for-information-systems
https://www.isaca.org/resources/isaca-journal/issues/2017/volume-2/how-to-align-security-initiatives-with- business-goals-and-objectives