You manage the remote access solution for your network. Currently you have two remote access servers, RA1 and RA2, with an additional server, RA3, configured as a RADIUS server. You need to configure RA1 and RA2 to forward authentication requests to RA3. What should you do?

a. On RA1 and RA2, run the Network Policy Server. Create a Remote RADIUS server group, identifying RA3 as the only member.
b. On RA1 and RA2, run the Network Policy Server. Create a network policy and specify RA3 as the MS-RAS Vendon
c. On RA1 and RA2, run the Network Policy Server. Add RA3 as a RADIUS server.
d. On RA1 and RA2, run Routing and Remote Access. Edit the properties of the server and configure it to use RA3 for authentication.