View the exhibit.

Area 1 and Area 2 in the topology are associated with/21 subnets, shown in Exhibit 1. All of the switches in this
topology are HP Provision ASIC switches, and they have established the appropriate adjacencies. In Area 1,
one of the/24 subnets within the/21 range, 10.1.19.0/24, is not used. The network administrator must prevent
unnecessary traffic from entering Area 1 if users attempt to reach an address in the unused range. What can
the administrator do that meets this requirement without disrupting the solution?

A.
Create a static route to 10.1.19.0/24 with the black hole option on routing switch A (and other area1
routers).

B.
Remove the stub definition for Area 1 on all routers and routing switches in Area 1.

C.
Suppress the advertisement of the default route in Area 1 on routing switch B, the area border router
(ABR).

D.
Enter range 10.1.19.0/24 no-summary in the OSPF configuration context of routing switch B, the area
border router (ABR).