Thermococcus, Methanococcus and Methanobacterium exemplify
A. Bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitrochondria
B. Bacteria that contain a cytoskeleton and ribosomes
C. Archarbacteria that contain protein homologous to eukaryotic core histones
D. Archaebacteria that lack any histones resembling those found in enkaryotes but whose DNA is negatively supercoiled