Good skills in book design? a) multimedia design b) graphic design c) desktop publishing

I’m going to go with B, because you have to have good graphic design skills to be able to design a book.

What are the choices

If your choices are: -cropping  -anti-aliasing-imperfection-contrastdownsampling is done to decrease the bit rate when transmitting over a limited bandwidth or to convert to a more limited audio format. this is the opposite of upsampling. so the answer is contrast.