HOTSPOT
Your network contains a RADIUS server named Server1.
You install a new server named Server2 that runs Windows Server 2012 R2 and has Network Policy
Server (NPS) installed.
You need to ensure that all accounting requests for Server2 are forwarded to Server1.
On Server2, you configure a Connection Request Policy.
What else should you configure on Server2? To answer, select the appropriate node in the answer
area.
Answer: 
Explanation:
Just quote from previous version ” you have a policy so “to ensure that all accounting requests for Server2 are forwarded to Server1”. You need to be sure Server1 is in the proper “Server Group”. The explanation is showing you why B is correct by showing you where a group can be created and/or assigned.”
B is correct, which is remote RADIUS server group
Magwif is spot on, you have a policy so “to ensure that all accounting requests for Server2 are forwarded to Server1”. You need to be sure Server1 is in the proper “Server Group”. The explanation is showing you why B is correct by showing you where a group can be created and/or assigned.
B is correct.