Which feature, if changed, would NOT abolish M13ʹs utility as a cloning vector?

Question

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M13's utility as a cloning vector is not inherently dependent on its ssDNA genome being single-stranded; it could still function if it were to become double-stranded (dsDNA), as the key features for its function as a vector (such as the ability to incorporate foreign DNA, the presence of necessary regulatory sequences, and the ability to replicate within a host) are not exclusively tied to the single-stranded nature of its genome.

Which Feature, If Changed, Would NOT Abolish M13ʹs Utility as a Cloning