About the definition of router roles within or between OSPF areas, which is correct? (Multiple Choice)
A . Internal router: refers to the router whose all interfaces belong to the same area.
B . ABR: A router that connects one or more areas and connects to the backbone area. These routers act as routing gateways for inter-domain communication.
C . Backbone router: refers to a router that has at least two interfaces that belong to the backbone area.
D . ASBR: It can be an internal router, a backbone router, or a regional edge router.
Answer: ABD