A site is shown in Figure 3.53. R1 and R2 are routers; R2 connects to the outside world. Individual LANs are Ethernets. RB is a bridge router; it routes traffic addressed to it and acts as a bridge for other traffic. Subnetting is used inside the site; ARP is used on each subnet. Unfortunately, host A has been misconfigured and does not use subnets. Which of B, C, and D can A reach?

Figure 3.53)

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C R1 A RB B R2 Rest of Internet D