An administrator is installing vCenter Server for an environment that has 40 ESXi 6.x Hosts and 150 virtual machines. Which database would meet the minimal requirements needed for this task?

vFabric Postgres is the embedded PostgreSQL database shipped with the vCenter Server Appliance (VCSA), requiring no separate database server or licensing, which makes it the minimal viable option. The VCSA embedded database supports the scale of 40 hosts and 150 VMs without external infrastructure. Because it is bundled and pre-configured, it represents the least complex database solution that still meets the deployment requirements.

Microsoft SQL Server Express 2008 has a hard 4 GB database size cap and is not supported for vCenter Server 6.x, making it technically invalid for this installation.

Microsoft SQL Server 2014 would support the environment but requires separate licensing and an external database server, exceeding what is minimally necessary.

Oracle 11g is a supported external database option but demands additional licensing and infrastructure, making it more than the minimal requirement for this deployment size.