Refer to the exhibit. During the last maintenance window, the network engineering team performed multiple software upgrades and enabled OSPFv3 for future use. However, when the network came up, the connection between HQ and the remote branch failed. A network engineer determined that routers R1 and R2 failed to establish an OSPFv2 adjacency. R1 was preconfigured with the point-to-point OSPF network type, and R2 as broadcast. The engineer confirmed that all connected interfaces are up, and the routers can reach one another via ICMP. Which action must the engineer take to resolve the issue?
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