Which vSphere DRS Automation Level ensures that virtual machines both have their placement performed automatically and migration recommendations are displayed but not applied?

The correct answer is Partially Automated. This vSphere DRS Automation Level allows for automatic placement of virtual machines while also providing migration recommendations. However, it does not automatically apply these recommendations, giving administrators an opportunity to review the suggestions before executing any migrations. This level strikes a balance by automating the initial placement of VMs based on resource availability, while still allowing human oversight for migrations that might affect workloads.

In contrast, the other options represent different automation levels. Manual requires manual intervention for both placement and resource adjustments, providing no automatic recommendations or actions. Fully Automated allows DRS to take complete control, automatically placing and migrating VMs according to policies without any user intervention, which might lead to less oversight. Aggressive would likely refer to a more proactive DRS approach in managing resources, potentially altering resource allocations more frequently, but it can lead to an environment where human input is diminished. Partially Automated is thus the best fit as it provides automation with a necessary layer of human decision-making.