What is the likely reason that the action failed?

A vSphere administrator needs to increase the capacity of an existing Storage Distributed
Resource Scheduler (SDRS) datastore cluster. The storage administrator has provisioned two
new NFS datastores to be added to the cluster.
The vSphere administrator receives an error message, preventing the administrator from adding
the newly provisioned datastores to the cluster.
What is the likely reason that the action failed?

A.
There are virtual machines running on the datastores being added to the cluster.

B.
The datastores in the SDRS cluster are VMFS datastores.

C.
The datastores in the existing cluster have hardware acceleration enabled and the new
datastores do not.

D.
The SDRS cluster has not been placed into maintenance mode.

Explanation: