A The shadow will be spread out to 30px top, 20px right, 10px bottom, 5px left.
B The position of the horizontal black shadow is 30px and the position of the vertical black shadow is 20px and blur distance is 10px and size of shadow is 5px.
C The position of the vertical black shadow is 30px and the position of the horizontal black shadow is 20px and size of shadow is 10px and blur distance is 5px.
D The shadow will be spread out to 30px top and bottom, 20px left and right with 10px blur distance, 5px shadow size.