What is the spatial relation betweeen the purple block and the blue block?
(A) The purple block is directly above the blue block, and they are in the same stack.
(B) The purple block is directly below the blue block, and they are in the same stack.
(C) The purple block and the blue block are at different stacks.
(D) At least one of the purple block and the blue block does not exist in the presented configurations.