Which option could be used for vSphere HA heartbeats?

A.
A Fibre Channel LUN on an 8GB active/active array backing a VMFS5 datastore

B.
An NFS datastore shared with the all hosts, sync, no_root_squash and read only options

C.
An iSCSI LUN used for booting the master ESXi host.

D.
An iSCSI LUN backing an RDM connected over 10GB Ethernet