Which of the following sets of animals belong to the class $Cyclostomata$?

  • A
    $Herdmania$ and $Petromyzon$
  • B
    $Petromyzon$ and $Myxine$
  • C
    $Amphioxus$ and $Balanoglossus$
  • D
    $Herdmania$ and $Myxine$

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