During the negative stain process, why do bacterial cells remain unstained?
a) Because the bacterial cells repel the stain due to their negative charge.
b) Because the stain is not able to penetrate the thick peptidoglycan layer of the bacterial cell wall.
c) Because the bacterial cells are transparent and do not absorb the stain.
d) Because the bacterial cells are washed with a decolorizing agent that removes any excess stain.
