Panel I shows a 3 by 3 layout of tiles, where each tile is itself a smaller 3 by 3 grid of filled and open dots. The two tiles in the bottom right corner of Panel I are missing. Panel II shows four candidate pairs of tiles, labelled (i) to (iv), that could fill this missing space.
Two tiles are missing in Panel I. Which one of the options in Panel II is the appropriate choice for the missing tiles?