Which router or routers will send a Network (Type 2) LSA for the network?

Click the Exhibit button.

In the exhibit, four routers (R1, R2, R3, and R4) are attached to a single Ethernet LAN and configured with addresses in the same subnet. All devices boot at the same time. Which router or routers will send a Network (Type 2) LSA for the network?

A.
R2

B.
R4

C.
R1 and R2

D.
R3 and R4