Where must the VMware vSphere Storage Appliance Manager (VSA Manager) be installed?

Where must the VMware vSphere Storage Appliance Manager (VSA Manager) be installed?

A.
On a Windows virtual machine created on the first VSA host

B.
The VSA Manager is deployed as a separate virtual appliance

C.
On a vCenter Server outside of the VSA environment

D.
It is pre-installed on the VMware vSphere Storage Appliance