The key is to answering your question is to understand just what the CONTROL RESOURCES process is trying to accomplish: Control Resources is the process of ensuring that the physical resources assigned and allocated to the project are available as planned, as well as monitoring the planned versus actual utilization of resources and taking corrective action as necessary.
Physical resource assignments - The physical resource assignments describe the expected resource utilization along with details such as type, amount, location, and whether the resource is internal to the organization or outsourced.
Resource breakdown structure - The resource breakdown structure provides a reference in case any resource needs to be replaced or reacquired during the course of the project. (corrective action).
Resource requirements - Resource requirements identify the needed material, equipment, supplies, and other resources. Planned resources.
In broadest terms, these inputs give the fullest picture of the available resources, planned resources and their utilization.
Hope this helps.