Refer to the Cisco IOS XR configuration exhibit.

Which statement about the configuration is true?

A.
This is a Level-2-only router.

B.
This is a Level-1-only router.

C.
The maximum IS-IS path metric is 63.

D.
This router belongs to area ID 0001.

E.
This configuration is missing the net configuration for the IPv6 unicast address family.

Explanation:
http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a00800a3e6f.shtml#wp39875