Which techniques can apply the proximity principle in a design?

a.  

touch, isolation, overlap, and combining

b.  

touch, close edge, gradation, and balance

c.  

touch, close edge, overlap, and combining

d.  

touch, close edge, unity, and contrast

based on the images pictured above, the major difference between the two cathedrals: the cathedral of notre dame and the amiens cathedral, is that the cathedral of notre dame emphasizes the horizontal lines while the amiens cathedral emphasizes the vertical lines.