Select the correct option regarding vectors used in recombinant $DNA$ technology.

  • A
    Bacteriophages and plasmids can replicate within the bacterial cells independent of the control of chromosomal $DNA$.
  • B
    Bacteriophages have very high copy numbers per cell.
  • C
    Plasmids have copy numbers of $1-2$ or sometimes $15-100$ copies per cell.
  • D
    All of the above.

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