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

Well, the four major ones to use would be contrast, proximity, alignment, and repetition. 

The correct answer is a.the castrati were classical singers with very high voice equivalent to that of a soprano, mezzo-soprano or contralto. this effect of high voice was produced by castration before puberty or an endocrinological condition. the castrati first started signing at the church but then they also sang at the opera. they did not only sang in italy but in many churches in europe. finally, they were singing male and female roles as well.