I have a diagram of an internetwork here in front of me and I'm experiencing a hard time figuring out how they arrived at the answer. Any help would be greatly appreciated. The question is as follow: The figure shows an internetwork, with IP addresses and default gateways shown for some devices. The addresses have been configured on the routers, and the PCs have been configured using the same subnet masks as the routers on the LANs. A routing protocol has been enabled, and both routers have learned all routes known by the other router. Which of the following statements is true regarding the behavior of IP in this network? The diagram consists of a serial link between two routers (R1 represent one router and R2 represents the other). On R1 you have interface S0/1 with an IP address of 192.168.6.18/30, the Ethernet interface IP address on R1 is 10.4.4.200/23. In addition, you have a host (PC1) attached to the LAN with an IP address of 10.4.4.4. The default gateway is 10.4.4.200. Next, you have interface S0/0 on R2 with an IP address of 192.168.6.17/30. The Ethernet interface IP address on R2 is 172.25.25.25/28. You have a host (PC3) attached to the LAN with the IP address of 172.25.25.26. The default gateway is 172.25.25.25. The choice for the answers is listed as follow:
a)a new PC added to the R1 LAN could be assigned IP address 10.5.0.0/23, default gateway 10.4.4.200 and be able to ping PC3
b)a new PC added to the R1 LAN could be assigned IP address 10.6.1.1/23, default gateway 10.4.4.200 and be able to ping PC3
c)The R1 LAN subnet supports more than 1100 host addresses
d)The R1 LAN subnet supports exactly 254 host addresses.
The reported answer is the first choice, A