Which Statement Correctly Explains the Gram Stain Reaction of Archaeal

Which statement correctly explains the Gram stain reaction of archaeal cells?

A) They are Gram-positive due to the pseudomurein layer in their cell walls.
B) They are Gram-negative due to the lack of peptdoglycan in their cell walls.
C) They don't stain - basic dyes used in the Gram stain don't adhere to archaeal cells.
D) Some are Gram-positive and some are Gram-negative due to the diverse chemical structure.