Which of the following is intracellular?

viruses are obligate intracellular parasites Viruses do not have cellular organizations They contain only one type of nucleic acid, either DNA Or RNA They are obligate intracellular parasites they lack enzymes necessary for synthesis and replication They multiply by a complex process and not by binary fission They are unaffected by antibacterial antibiotics Ref: Ananthanarayan & paniker's Textbook of Microbiology 9th edition pg no 427