A simple stain was also performed on the colony B isolate using methylene blue, a dye which stains cells blue. Which of the following statements is true?
1) Methylene blue is a dye that stains cells red.
2) The colony B isolate did not take up the methylene blue dye.
3) The colony B isolate turned blue after the methylene blue stain.
4) Methylene blue is a dye that stains the surrounding medium blue.