The IT strategy is the document that defines how IT will be used to support and achieve the business objectives of the organization. It aligns the IT investments, resources, and activities with the business priorities and direction. When there is a change in the business objectives, such as a re-prioritization by management, the IT strategy should be updated accordingly to ensure that IT remains relevant and aligned with the new business goals. Updating the IT strategy should be done first before allocating resources to IT processes, because it provides the basis for determining which IT processes are most critical and valuable for the organization. The other options are not the best actions to perform first in this scenario. Performing a maturity assessment, implementing a RACI model, and refining the human resource management plan are all useful activities for improving the IT processes, but they are not directly related to the change in business objectives.
They should be done after updating the IT strategy, based on the new strategic direction and priorities.
References:
1: https://www.projectpractical.com/human-resource-management-plan-template-free-download/
2: https://open.lib.umn.edu/humanresourcemanagement/chapter/2-2-writing-the-hrm-plan/
3: https://www.isixsigma.com/getting-started/are-you-ready-how-conduct-maturity-assessment/
4: https://www.smartsheet.com/content/organizational-maturity
5: https://www.process.st/maturity-model/