What Do the Gram Stain, the Acid-Fast Stain, and the Endospore

Multiple Choice

What do the Gram stain, the acid-fast stain, and the endospore stain have in common?

A) They use heat to force the dye into cell structures.
B) The staining outcome varies with the charge of the cell wall.
C) They are used on a wet mount of the specimen.
D) They are differential stains.
E) They use a negative stain technique.