What are two reasons why a datastore in a Storage DRS cluster cannot enter maintenance mode? (Choose
two.)

A.
Storage latency is too high to allow Storage DRS initiate Storage vMotion.

B.
Storage DRS is configured for a VMFS3 datastore.

C.
Storage DRS is disabled on the virtual disk.

D.
Rules prevent Storage DRS from making migration recommendations.

Explanation:
https://pubs.vmware.com/vsphere-51/index.jsp?topic=%
2Fcom.vmware.vsphere.troubleshooting.doc%2FGUID-91D4FBBC-0677-44DA-B0F2-43A3504F8CA0.html