There are three types of robots A, B and C in a laboratory. Type A can recognize color, type B can recognize shape, and type C can neither recognize color nor shape. The laboratory experimented with red ball, blue ball, red square and blue square on robots 1 and 2 and ordered them to pick up the red ball, but 1 picked up the red square and 2 picked up the blue ball.
1 is not type B and 2 is not type A is correct according to the above experiment.