What should you allow from Windows Firewall on Server1?

Your network contains a server named Server1 that runs Windows Server 2008 R2.
You plan to deploy DirectAccess on Server1.
You need to configure Windows Firewall on Server1 to support DirectAccess connections. What should you allow from Windows Firewall on Server1?

A.
ICMPv6 Echo Requests

B.
ICMPv6 Redirect

C.
IGMP

D.
IPv6-Route