You are configuring failover clustering.
You need to install multipath support on the servers.
What should you do?

A.
Run the Dism /online /enable-feature: MultipathIo command.

B.
Run the mpiocpl.exe command.

C.
Run the mpclaim.exe command.

D.
Run the ocsetup /w MultipathIo command.

Explanation:
To install MPIO on Server core on Windows Server 2008 run this command from a
command prompt “ocsetup MultipathIo /norestart” and then run “ mpclaim –r –i –a “”
This command Installs the Microsoft MPIO Optional Component on non Server Core
installations and then sets the Microsoft MPIO DSM (MSDSM) to claim all unclaimed
Microsoft MPIO devices in the system.
MPCLAIM Command Line Reference:
Usage: mpclaim reboot_option install_switch device_switch device_hwid(s) reboot_option
Whether to automatically reboot or not
-r automatically reboot without prompting
-n suppress reboot request (CALLER IS EXPECTED TO REBOOT) install_switch Whether
to add or remove MPIO support
-i install MPIO optional component and add multipath support for device
-u remove multipath support for device and uninstall MPIO OC if no remaining devices are
configured for MPIO device_switch Whether to apply above options to all devices or passedin devices
-d following parameters indicate hardware ids of devices
-a work on all applicable devices
-c work on only all SPC3-compliant devices (meaningful only in the context of install. If used
with ‘- u’, it is treated as ‘-a’)
device_hwid HardwareIDs of Devices to be MPIO’d, as strings of vendor8product16,
delimited by a space (Note: Use empty string with ‘-a’ option)
http://blogs.msdn.com/b/san/archive/2008/07/27/microsoft-mpio-command-linereferencempclaim-and-servercore-configuration.aspx
Wrong answer:
Enable MPIO –> Dism /online /enable-feature:MultipathIo
Important
When using DISM to enable or disable features, the feature name is case-sensitive.
http://technet.microsoft.com/en-us/library/ee619752(v=WS.10).aspx