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A is right
The witness host is located at the witness site and stores witness components for VM objects:
• Each stretched vSAN cluster must have its own witness host.
• The witness host is not a cluster member.
The host can be a physical host or a virtual appliance downloaded from the VMware website:
• Physical witness hosts:
– Require standard vSphere licensing
– Cannot start VMs that were previously running on the host
• Virtual witness hosts:
– Are virtualized ESXi hosts running in a virtual appliance
– Cannot run any VMs
– Require less capacity and bandwidth than regular ESXi hosts
– Are packaged by VMware with their own embedded license
Taken from vSAN 6.7 Deploy and Manage Lecture Manual - About Witness Hosts section
A. Reduced vSphere Licensing
https://storagehub.vmware.com/t/vsan-stretched-cluster-guide/witness-host-sizing-13/
vSAN Witness Appliance (Virtual Machine)
Deploying the vSAN Witness Appliance that is provided by VMware is the recommended deployment choice for a vSAN Witness Host. When choosing this deployment option, there are some requirements to consider.
Licensing
A license is hard coded in the vSAN Witness Appliance and is provided for free from VMware.
Physical Host as a vSAN Witness Host
If using a physical host as the vSAN Witness Host there are some requirements to consider.
Licensing
If using a physical host as a vSAN Witness Host, it must be licensed with a valid vSphere license.
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