A. In the contoso.com domain, add Server1 to the RAS and IAS Servers group.
B. In the contoso.com domain, add Server1 to the Windows Authorization Access group.
C. In the eu.contoso.com domain, add Server1 to the RAS and IAS Servers group.
D. In the eu.contoso.com domain, add Server1 to the Windows Authorization Access group.