There are 3 shapes on a 4x4 grid. Which shape is closest to the red right_triangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: red right_triangle at (0, 1)
Distance from target shape to yellow rectangle at (2, 0): 3
Distance from target shape to gray trapezoid at (3, 2): 4
Closest shape is the yellow rectangle at (2, 0) with distance 3</think>

<answer>(2, 0)</answer>