Answer: Option 3Concept: The Routers only contains 3 layer that's the reason sometimes they also called as 3-layer switch.The Router is a physical or virtual internetworking device that is designed to receive, analyze, and forward data packets between computer networks. A router examines a destination IP address of a given data packet, and it uses the headers and forwarding tables to decide the best way to transfer the packets.Explanation: At Intermediate Router R the packet will not go beyond the network layer. Hence Network layer will only be visited once at both the routers.But the Data link layer will be visited twice.Hence Network layer will be visited 4 times and the Data link layer will be visited 6 times (1 + 2 (at R) + 2 (at R) + 1 = 6 )