very simple topology with two areas.
1. R1 and R2 are backbone and ABR routers that sits between area 0 and area 5 (totaly stub)
2. R3 and R4 are Internal routers in area 5
3. R1 and R2 has "area 5 stub no-summary" configured
does R3 and R4 need
A. area 5 stub
B. area 5 stub no-summary