Refer to the small php script given below:

<?php

class person{

  function getSal()

  {

         . . .

         . . .

  }

}

class emp extends person{

  function getSal()

  {

           ???

  }

}

?>

The getSal() of emp has to behave exactly as getSal() of person. Which of the following lines of code would you use to replace the '???'

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