Which description of the OSPF protocol in the following is wrong?

Which description of the OSPF protocol in the following is wrong?
A . The area border router (ABR) connects multiple areas and maintains the same LSDB for all areas.
B . The metric value of AS-external-LSA can be specified when external routes are imported. The default value is 1.
C . The external routing information can carry a tag. The tag information is contained in 5 LSAs and 7 LSAs.
D . The Link State ID in ASBR-Summary-LSA is set to the router ID of this ASB

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Answer: A