(B) The correct answer is $(b)$. Single-stranded $DNA$ is found in certain bacteriophages such as $\phi \times 174$,$S-13$,$F-1$,$M-13$,and in some vi

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(B) The correct answer is $(b)$. Single-stranded $DNA$ is found in certain bacteriophages such as $\phi \times 174$,$S-13$,$F-1$,$M-13$,and in some viruses like Parvoviruses. In contrast,$E. coli$,$\lambda$ phage,and $T_4$ phage contain double-stranded $DNA$ as their genetic material.