What will cause a file restore to a Windows VM to fail?

What will cause a file restore to a Windows VM to fail?
A . The IBM Spectrum Protect Plus Service is not set to Act as part of the operating system in the guest.
B . iSCSI service is not started in the guest.
C . A user is logged into the desktop of the guest and the file is being restored to that desktop.
D . The IBM Spectrum Protect Plus File Restore Enabler is not installed in the guest.

Answer: D