Cat6500(config)# router ospf 1
Cat6500(config-router)# network 0.0.0.0 255.255.255.255 area 0 Cat6500(config-router)# nsf
Cat6500(config-router)#end

Refer to the exhibit. The configuration is used to enable nonstop forwarding for OSPF on a Catalyst 6500 Series Switch with redundant supervisor engines. The default CEF configuration is unchanged. After testing, user traffic is interrupted and NSF is not operational. What is the most likely reason?
Select the best response.

A.
CEF was not properly configured.

B.
OSPF was not properly configured for graceful restart.

C.
Stateful switchover was not correctly configured.

D.
NSF for OSPF is only supported in area 0.