Which rule should be used in an SDRS environment to create a VM requiring virtual disks be kept on different datastores?

Which rule should be used in an SDRS environment to create a VM requiring virtual disks be kept on different datastores?
A. VM Anti-Affinity Rule
B. Intra-VM VMDK Affinity Rule
C. VM-Host Affinity Rule
D. Intra-VM VMDK Anti-Affinity Rule