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