Wrong , the Answer is A- read the same article - If such a secondary host is exchanging heartbeats with a datastore, the primary host assumes that the secondary host is in a network partition or is network isolated. So, the primary host continues to monitor the host and its virtual machines.
For this Question B is the right Answer as the Master/Primary Host will reboot the vms on the secondary host if it doesn't receive heart beats on the mgmt network.
So, B is correct.
A
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.avail.doc/GUID-4BC60283-B638-472F-B1D2-1E4E57EAD213.html#:~:text=In%20the%20vSphere%20Web%20Client,and%20click%20Create%20a%20Cluster.&text=Select%20vSphere%20Availability%20and%20click,has%20notified%20a%20health%20degradation.
Verify that you have configured hosts with at least two datastores to provide redundancy for vSphere HA datastore heartbeating.
Correct
https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.avail.doc/GUID-4ED552C3-0291-4553-A46A-290EF883BC8D.html
If a master host cannot communicate directly with the agent on a subordinate host, the subordinate host does not respond to ICMP pings. If the agent is not issuing heartbeats, it is viewed as failed. The host's virtual machines are restarted on alternate hosts.
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