A customer wants to implement a RADIUS Single Sign On (RSSO) solution for multiple FortiGate devices. The customer’s network already includes a RADIUS server that can generate the logon and logoff accounting records. However, the RADIUS server can send those records to only one destination.
What should the customer do to overcome this limitation? http://docs.fortinet.com/uploaded/files/1937/fortigate-authentication-52.pdf

A.
Send the RADIUS records to an LDAP server and add the LDAP server to the FortiGate configuration.

B.
Send the RADIUS records to an RSSO Collector Agent.

C.
Send the RADIUS records to one of the FortiGate devices, which can replicate them to the other FortiGate
units.

D.
Use the RADIUS accounting proxy feature available in FortiAuthenticator devices.