Which tool should you use?

You have a server named Server1 that runs Windows Server 2012 R2.
Windows Server 2012 R2 is installed on volume C.
You need to ensure that Safe Mode with Command Prompt loads the next time Server1 restarts.
Which tool should you use?

A.
The Restart-Server cmdlet

B.
The Bootcfg command

C.
The Restart-Computer cmdlet

D.
The Bcdedit command

Explanation:
http://support.microsoft.com/kb/317521
http://technet.microsoft.com/en-us/library/hh849837.aspx
http://technet.microsoft.com/en-us/library/cc731662(v=ws.10).aspx

You can see with msconfig tool that boot options have changed as follows:
NOTE: Alternate Shell may be used

After reboot you should remove the safeboot option using bcdedit:
– bcdedit /deletevalue safeboot