Which action should the vSphere administrator take to resolve the Out of Space problem without requesting additional space on the storage array?

A Windows Server 2008 virtual machine with the following configuration receives an Out of Space
condition indicator:

• The virtual machine uses thin provisioned virtual disks.
• The VMFS5 datastore on which the virtual machine’s files reside is on a thin provisioned LUN.
• 30% of the VMFS datastore content is no longer needed.
• The storage array supports VASA and VAAI.
Which action should the vSphere administrator take to resolve the Out of Space problem without
requesting additional space on the storage array?

A.
Delete unneeded files on the VMFS datastore and then use vmkfstools to reclaim deleted
blocks.

B.
Delete unneeded files on the VMFS datastore, right-click the datastore in vSphere Web Client,
and then select the Reclaim Deleted Blocks option.

C.
Delete some files from the guest OS and defrag its file system.

D.
Delete some files from the guest OS and use vmkfstools to reclaim the deleted blocks.

Explanation: