B is right
https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.avail.doc/GUID-0502B198-F5F7-4101-969C-C5B6F364C678.html#GUID-0502B198-F5F7-4101-969C-C5B6F364C678
D is correct , as If a master host is unable to communicate directly with the agent on a slave host, the slave host does not respond to ICMP pings, and the agent is not issuing heartbeats it is considered to have failed. The host's virtual machines are restarted on alternate hosts.
Datastore heartbeating allows vSphere HA to monitor hosts when a management network partition occurs and to continue to respond to failures that occur. You can specify the datastores that you want to be used for datastore heartbeating.
It talks about management networks; HA doesn't kick in if hosts can't communicate over that network. There'd be chaos across DC's worldwide if it did :D .... B is correct.
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