What is the difference between a primary oocyte and a secondary oocyte?

  • A
    Primary oocyte is diploid $(2n)$,while secondary oocyte is haploid $(n)$.
  • B
    Primary oocyte is formed before birth,while secondary oocyte is formed after puberty.
  • C
    Primary oocyte undergoes meiosis-$I$,while secondary oocyte undergoes meiosis-$II$.
  • D
    All of the above.

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