What is indicated by $'A'$ and $'B'$ in the given diagram?

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  • A

    $A$ - Exine, $B$ - Male flower

  • B

    $A$ - Tube nucleus, $B$ - Exine

  • C

    $A$ - Stigma, $B$ - Female flower

  • D

    $A$ - Intine, $B$ - Pollen tube

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