What is/are true about heartwood?

$I.$ It does not help in water conduction.

$II.$ It is also called alburnum.

$III.$ It is dark in colour but very soft.

$IV.$ It has tracheary elements, which are filled with tannin, resin, etc.

  • A

    $II, III$ and $IV$

  • B

    $I$ and $IV$

  • C

    $II$ and $IV$

  • D

    $I, II$ and $III$

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