Refer to the exhibit. Which two statements about the network diagram are true? (Choose two.)

Refer to the exhibit.
Which two statements about the network diagram are true? (Choose two.)

A. The subnet address of PC-B has 18 bits dedicated to the network portion. B. One of the routers has two connected serial interfaces. C. R1 and R3 are in the same subnet. D. PC-A and PC-B are in the same subnet. E. The subnet of PC-C can contain 256 hosts.