Refer to the Exhibit.
Area 1 has three network links. You need to summarize the network addresses in Area 1 so that
Area 0 sees one route representing the network links. A route to each loopback address must still
be visible in Area 0.Which configuration sample on R3 and R5 will complete this task? 
A.
Option A
B.
Option B
C.
Option C
D.
Option D
A is the correct ans;
Syntax
area-range network/mask-length ;
Options
exact—(Optional) Summarization of a route is advertised only when an exact match is made with the configured summary range.
restrict—(Optional) Do not advertise the configured summary. This hides all routes that are contained within the summary, effectively creating a route filter.
Ref: http://www.juniper.net/techpubs/en_US/junos12.3/topics/reference/configuration-statement/area-range-edit-protocols-ospf.html
not displaying these “” in the syntax … changing to []
Syntax
area-range network/mask-length [exact] [override-metric metric] [restrict];
B is the correct answer.
If you use the restrict option the routes will not show up in area 0.
If you use the exact option the will show up for the /32s.