The figure shows an internetwork, with IP addresses and default gateways 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 are true about the behavior of IP in this network?

PC$1$ should be able to ping PC$3.$

PC$3$ should not be able to ping PC$1.$

PC$1$ is in a different subnet than R$1\text{'}$s LAN interface.

PC$3$ is in a different subnet than R$3\text{'}$s LAN interface.