Consider the following statements regarding the $ABO$ blood group in humans:
$I.$ It is controlled by multiple alleles.
$II.$ It shows codominance.
$III.$ Codominance can be manifested phenotypically in humans.
$IV.$ It follows Mendel's law of inheritance.
Which of the following statement$(s)$ are correct?

  • A
    Only $I$ is correct
  • B
    $I$ and $II$ are correct
  • C
    $II$ and $III$ are correct
  • D
    $IV$ and $II$ are correct

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