Refer to the exhibit. Router C was configured so that it could form an adja cency with three OSPF neighbors, one connected to each of its three physical interfaces. Which statement is correct about router C?（）

• A、It is configured and functioning correctly as an OSPF internal router.
• B、It is configured and functioning correc tly as an ABR attached to stub area 4.
• C、It is configured and functioning correctly as an ASBR attached to external area 4.
• D、It is configured and functioning correctly as an ABR attached to totally stubby area 4.
• E、It is not configured correctly to  function as specified.