Final answer:
Distributed Resource Scheduler (DRS) is the feature that works with vMotion to balance the resource usage of VMs across hosts by automatically placing and moving VMs based on resource needs and rules.
Step-by-step explanation:
The feature that can be used along with vMotion to balance the resource usage of VMs across hosts is A) Distributed Resource Scheduler (DRS). Distributed Resource Scheduler is a VMware feature that automatically balances computing workloads with available resources in a virtualized environment. DRS works by using a set of rules and policies to determine where to place or move virtual machines in order to optimize the use of physical resources such as CPU and memory across a cluster of hosts.
B) High Availability (HA) is more focused on ensuring that VMs remain available and provides minimal downtime by restarting VMs on other hosts if their original host fails.
C) Fault Tolerance (FT) is similar to HA in that it provides continuous availability for applications by creating a live shadow VM that is in lockstep with the original, thereby ensuring no data loss or service interruptions in the event of a host failure.
D) Storage vMotion is another VMware feature that allows for the live migration of VM disk files across different storage arrays without downtime, which is different from balancing resource usage across hosts.