Final answer:
The DRS cluster-level resource management capability is DRS Load Balancing, which optimizes the distribution of workloads across hosts in a VMware cluster.
Step-by-step explanation:
The question is asking about Distributed Resource Scheduler (DRS) cluster-level resource management capabilities within a virtualized environment, specifically VMware. The correct answer to which feature is a DRS cluster-level resource management capability is DRS Load Balancing.
DRS Load Balancing works by automatically balancing the workload across the hosts in a cluster to ensure that no single host is overutilized while others are underutilized. This is done by migrating virtual machines (using VMotion) from one host to another with minimal impact on the performance.
Another option mentioned, Resource Pools, are a way to hierarchically partition available CPU and memory resources among virtual machines. While VM-Host Affinity Rules are used to set affinities and anti-affinities between virtual machines and hosts, they are not considered a DRS capability focused on resource management but rather on VM placement.