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Question :-

A L3VPN customer is connected to one of your PE routers by using OSPF as CE-PE protocol and was successfully exchanging VPN routes. It came to your attention that OSPF adjacency became stuck in "EXCHANGE" state recently. What is the most likely cause for this issue?
A corrupted OSPF LSA was originated by the CE.
The OSPF cost metric is changed on the CE after the first bring up
The CE-PE link is severely degraded after the first bring up.
The MTU setting is changed on the CE after the first bring up.
The CE-PE link is congested with traffic

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