What is the counterstain and what does it do. How do the gram-positive and gram-negative cells react?
a) Safranin, stains gram-positive cells pink and gram-negative cells purple
b) Crystal violet, stains both gram-positive and gram-negative cells purple
c) Methylene blue, stains both gram-positive and gram-negative cells blue
d) Safranin, stains gram-negative cells pink and gram-positive cells purple