Final answer:
It is true that the vCenter Server Appliance uses vFabric Postgres as its embedded database and supports IPv4 and IPv6 in mixed mode, allowing for flexible network configurations.
Step-by-step explanation:
The statement that vCenter Server Appliance uses vFabric Postgres for the embedded database and supports both IPv4 and IPv6 in mixed mode is True. The vCenter Server Appliance is a preconfigured Linux-based virtual machine optimized for running VMware vCenter Server and its associated services. The embedded vFabric Postgres database is a robust data management platform used by the appliance. VMware does support mixed-mode operation of IPv4 and IPv6, which allows for a transition strategy where both protocols can coexist and function within the network infrastructure managed by the vCenter Server Appliance. This facilitates flexible deployment scenarios and ensures compatibility as networks evolve to accommodate the newer IPv6 protocol alongside the more established IPv4.