What is the correct description for the internal structure of cilia and flagella?

  • A
    $A$ pair of centrally located microtubules and $9$ pairs of radially arranged peripheral doublets.
  • B
    $A$ middle hub and $9$ peripherally arranged triplets.
  • C
    $A$ central sheath and $9$ pairs of peripherally arranged doublets.
  • D
    One pair of centrally located microtubules and $9$ peripherally arranged triplets.

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