Final answer:
The databases supported for vCenter on Windows are SQL Server, Oracle, and PostgreSQL. DB2 is not supported.
Step-by-step explanation:
If the vCenter appliance is used, the databases supported for vCenter on Windows include: A) SQL Server, B) Oracle, and D) PostgreSQL. Option C) DB2 is not supported for vCenter on Windows.
It is important to note that the vCenter Server Appliance (VCSA) uses its own embedded Postgres database, so when using the appliance version, an external database is not typically utilized.