All servers in your environment run Windows Server 2003. Your network is divided into several IP subnets that are connected by dedicated routers. You plan to install new Routing and Remote Access service (RRAS) servers to replace the existing routers. You need to enable a routing protocol on the RRAS servers that uses link state in route decision making and supports variable- length subnet masks.

Which protocol should you use?

A.
Open Shortest Path First (OSPF)

B.
Routing Information Protocol (RIP) v1

C.
Routing Information Protocol (RIP) v2

D.
Internet Group Management Protocol (IGMP)