There are three blocks, A, B and C. Block C is below block B and above block A. Block A has one big yellow circle. A medium black triangle is touching the bottom edge of this block. The big yellow circle is touching the right edge of this block. Below and to the left of the big yellow circle there is the medium black triangle. Block B has a small blue square. And block C has one medium black square. One small blue triangle is also touching the bottom edge of this block. Near to the medium black square there is the small blue triangle.
What is above the medium black triangle? a medium black square or a small blue square?
medium black square  small blue square  both of them none of them