Refer to the Exhibit.
— Exhibit –ISIS Trace options :
May 21 20:58:25.3 ERROR: interface ae1.12 MTU 1200 is too small
Interface configuration :
user@router# show interfaces ae1.12
vlan-id 12;
family inet {
address 10.1.1.1/24;
}
family iso {
mtu 1200;
}
— Exhibit –An IS-IS adjacency does not come up between two directly connected routers.
Referring to the exhibit, what would cause this problem?

A.
The neighboring router has a larger MTU configured.

B.
The MTU configured on the interface is less than the IS-IS minimum MTU requirement.

C.
MTU has been configured for family iso instead of family inet.

D.
The MTU configured on the interface is higher than the maximum MTU supported by IS-IS.

Explanation: