Managing resources as part of the portfolio strategy would best help to ensure the appropriate allocation of IT resources to support an enterprise’s mission. This is because the portfolio strategy aligns the IT investments with the business goals and priorities, and ensures that the IT resources are allocated to the most valuable and strategic initiatives. By managing resources at the portfolio level, the enterprise can optimize the use of its IT resources across multiple programs and projects, and avoid resource conflicts, shortages, or wastages. A resource strategy as part of program management, prioritizing program requirements based on existing resources,and resource planning for each IT project are all useful practices, but they are not sufficient to ensure the appropriate allocation of IT resources at the enterprise level. They may only focus on the resource needs and constraints of specific programs or projects, and may not consider the overall alignment and optimization of IT resources with the enterprise’s mission. References := IT Portfolio Management: A Practitioner’s Guide - ISACA, Resource Allocation Done Right: Best Practices for 2022 & Beyond, A Complete Guide to Resource Allocation in Projects - Float