The aim of resource management primarily focuses on preserving resources for future generations. This includes the sustainable use and maintenance of natural resources to ensure that they remain available for future use, balancing the needs of the present with those of the future.
While the other options you mentioned (scheduling resource use, knowing when resources need replacing, and preventing resources from leaving a state) are aspects of resource management, they are more specific tactical components rather than the overarching goal. The primary aim is indeed sustainability and preservation.