If you are referring to the question:
Tab_A Tab_B
Id_A Ds_A Id_B Ds_B
---- ----- ---- ----
1 A1 2 B1
2 A2 3 B2
3 A3 4 B3
Select Id_A,Id_B,Ds_A,Ds_B
from Tab_A
Join Tab_B
On Id_A = Id_B
I would completely agree that none of the available answers is correct. Just to be sure I wasn't missing something, I tried each of the solutions; none produced the same result set as the join given above.