In the given figure,each box represents a function machine. $A$ function machine illustrates what it does with the input. Which of the following statements is correct?

  • A
    $z=2x+3$
  • B
    $z=2(x+3)$
  • C
    $z=\sqrt{2x+3}$
  • D
    $z=\sqrt{2(x+3)}$

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