Refer to the exhibit. The show ip ospf interface command has been executed on R1. How is OSPF configured? 

Answer options:

A. A point-to-point network type is configured.
B. The interface is not participating in OSPF.C. The default Hello and Dead timers are in use.
D. There are six OSPF neighbors on this interface.

C

From the output we can see there are Designated Router & Backup Designated Router for this OSPF domain so this is a broadcast network (point-to-point and point-to-multipoint networks do not elect DR & BDR). By default, the timers on a broadcast network (Ethernet, point-to-point and point-to-multipoint) are 10 seconds hello and 40 seconds dead. The timers on a non- broadcast network are 30 seconds hello 120 seconds dead. From the line Neighbor Count is 3, we learn there are four OSPF routers in this OSPF domain. Reference: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13689-17.html