Refer to the exhibit.

IRF 3 and Switches 1, 2 and 4 are successfully implementing OSPF on the interfaces shown in the
exhibit. Then IRF 3’s 10.1.10/24 link fails. Connectivity between Server 1 and Server 2 is disrupted
for about 30 seconds.
What can the network administrator do to prevent this issue from occurring again?

A.
Enable opaque LSAs on each of the switches; set the OSPF graceful restart mode to IETF
mode on at least IRF 3.

B.
Set the OSPF dead timer on each of the switches to equal the hello timer

C.
Set up OSPF Bidirectional Forwarding Detection (BFD) on each switch VLAN 10 interface.

D.
On IRF 3, set up Bidirectional Forwarding Detection (BFD) Multi-Active Detection (MAD) on a
dedicated link between the members.

Explanation: