Which step can be taken to enable access to the .iso file for the affected virtual machine?

An administrator is updating a program running on a virtual machine. The update file has
been downloaded as an .iso file and placed on a shared NFS datastore. An attempt to
mount the .iso file to the virtual machine fails, but subsequent testing shows that the .iso file
can be mounted to a virtual machine running on another ESXi 5.x host. Which step can be
taken to enable access to the .iso file for the affected virtual machine?

A.
Rescan all datastores on the ESXi host running the affected VM.

B.
Unmount the volume from the ESXi host running the affected VM, and then add as a new
datastore.

C.
Refresh all datastores on the ESXi host running the affected VM.

D.
Reboot all ESXi hosts in the cluster where the affected virtual machine is running.