Facultative, Intracellular Parasitic Bacteria Are Those Which Are

Facultative, intracellular parasitic bacteria are those which are

A) able to be cultured with or without oxygen but in cell cultures only.
B) able to exist in both intracellular and extracellular environments.
C) able to be cultured only with oxygen and in cell cultures.
D) can only be cultured inside living organisms like mice.