What will be the output of the following program when the button is clicked on?
```
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim word As String
word = "hairbrush"
Decapitate(word)
txtBox.Text = word
End Sub
Sub Decapitate(ByRef word As String)
'Chop the first letter off the word.
word = word.Substring(1)
End Sub
```
(A) airbrush
(B) hairbrush
(C) hairbrus
(D) h
(A) airbrush
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