D - https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.resmgmt.doc%2FGUID-DD00FADE-93A9-47D0-A571-E5F6948E2FB2.html
Create Intra-VM Anti-Affinity Rules
You can create a VMDK anti-affinity rule for a virtual machine that indicates WHICH of its virtual disks must be kept on different datastores.
Create Inter-VM Anti-Affinity Rules
You can create an anti-affinity rule to indicate that ALL virtual disks of certain virtual machines must be kept on different datastores. The rule applies to individual datastore clusters.
You can create Storage DRS anti-affinity rules to control which virtual disks should not be placed on the same datastore within a datastore cluster. By default, a virtual machine's virtual disks are kept together on the same datastore.
As the question talk about virtual disk, we should refer to VMDK.
Intra-VM VMDK Affinity Rule
Intra-VM VMDK Anti-Affinity Rule
And after the question refer to "Different Datastore" it let us with one option
Intra-VM VMDK Anti-Affinity Rule
This links shows it clearly
https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.resmgmt.doc/GUID-A55935B4-2B4E-48A4-9D53-BB13ABDD5A60.html
D is correct. Here is the vSphere 6.7 doc link,
https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.resmgmt.doc/GUID-FC84ECD9-C7DA-4D27-B5EC-0C8E396A6800.html
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