Given the above OSPF network, which command will RTB use to summarize routes for the
192.168.16.0/22 supernet before injecting them into Area 0?

A.
area 10 range 192.168.16.0 255.255.252.0

B.
summary-address 192.168.16.0 255.255.252.0

C.
ip summary-address ospf 101 192.168.16.0 255.255.252.0

D.
area 0 range 192.168.16.0 255.255.252.0

E.
ip summary-address area 0 192.168.16.0 255.255.252.0

Explanation:
The area rangecommand is used only with Area Border Routers (ABRs) which is router RT2 in
this example. It is used to consolidate or summarize routes for an area. The result is that a single
summary route is advertised to other areas by the ABR. Routing information is condensed at area
boundaries. External to the area, a single route is advertised for each address range. Only Choice
A specifies the correct syntax and route summarization network mask.