Consider the scenario shown in Figure below in which a server is connected to a router by a 100Mbps link with a 50ms propagation delay. Initially this router is also connected to two routers, each over a 50Mbps link with a 200ms propagation delay. A 1Gbps link connects a host and a cache (if present) to each of these routers and we assume that this link has 0 propagation delay. All packets in the network are 20,000 bits long. Server 100 Mbps 50 ms 50 Mbps 200 ms 50 Mbps 200 ms 1 Gbps Oms 1 Gbps O ms Client Cache Cache Client What is the end--to---end delay from when a packet is transmitted by the server to when it is received by the client? In this case, we assume there are no caches, there's no queuing delay at the routers, and the packet processing delays at routers and nodes are all 0. O a. 250.62 ms O b. 400 us O c. 250 ms O d. 200 us