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What will be the output of the following PHP code ?

<?php
function A1($x)
{
  switch($x)
  {
  case 1: 
    //this statement is the same as if($x == 1)
    echo 'Case 1 was executed.';
    break;
  case 2: 
    //this statement is the same as if($x == 2)
    echo 'Case 2 was executed.';
    break;
  case 3: 
    //this statement is the same as if($x == 3)
    echo 'Case 3 was executed.';
    break;
  case 4: 
    //this statement is the same as if($x == 4)
    echo 'Case 4 was executed.';
    break;
  default: 
    //this statement is the same as if $x does not equal the other conditions
    echo 'Default was executed.';
    break;
  }
}
A1(9);
?>