Thanks to Anti-affinity rules, VMware Fault Tolerant virtual machines are:

A.
Sometimes located on the same host, but only in a powered off state

B.
Never located within the same cluster

C.
Never located on the same host

D.
Sometimes located on the same host if an HA event occurs

Explanation:
The anti-affinity check is performed when the Primary VM is powered on. It is possible that the Primary and Secondary VMs can be on the same host when they are both in a powered-off state. This is normal behavior and when the Primary VM is powered on, the Secondary VM is started on a different host at that time.