The Thermoacidophile Sulfolobus Acidocaldarius Lacks Peptidoglycan but Still Possesses a Cell

The thermoacidophile Sulfolobus acidocaldarius lacks peptidoglycan but still possesses a cell wall.What is likely to be true of this species?

A) It is a bacterium with enzymes that can function above a pH of 7 and withstand high temperatures.
B) It is an archaean that could inhabit hot springs with alkaline conditions.
C) It is an archaean that could inhabit hydrothermal vents if the optimal pH of its enzymes lies below pH 7.
D) It is likely a gram-positive bacterium that has the ability to cope with high acidity and temperatures.