Which are correct to describe viruses? I. Simple and unicellular organisms. II. Contain DNA or R...

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Which are correct to describe viruses?
I. Simple and unicellular organisms.
II. Contain DNA or RNA and enclosed by protein coat.
III. Possess own metabolic system and respond to stimuli.
IV. Maintain genetic continuity and undergo mutations.
(A) I and II
(B) II and IV
(C) II and III
(D) I and III
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