Designing Cisco Network Service Architectures (ARCH) (#146)

An organization is using a link state routing protocol that is not dependent on IP addressing. Which action should be taken to enable routing across area boundaries in this environment?

Assign Level 1 router interfaces to different areas
Assign Level 2 routers to different areas
Assign Level 1 routers to different areas
Assign Level 2 router interfaces to different areas
Assign Level 2 router interfaceto the backbone area
Assign Level 1 router interface to the backbone area