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