You have configured OSPF on Router
B. The network command entered was network 197.234.3.0 0.0.0.63 area 0. You find out that one of the interfaces is not participating in OSPF. Which interface is not participating? Refer to the following exhibit.

A. Interface Serial 0/3/0
B. Interface Serial 0/3/0.1
C. Interface Serial 0/3/0.2
D. Interface GigabitEthernet 0/0

D. Interface GigabitEthernet 0/0 is not participating because it is in a different network than what the wildcard mask is advertising. The wildcard mask of 0.0.0.63 is a /26 network mask with the range of 197.234.3.0 to 197.234.3.63. The interface Gi0/0 is in the 197.234.3.64/26 network and therefore will not participate.