What will be the output of the following program when the button is clicked on?
```
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim var1, var2, num As Integer
var1 = 2
var2 = 4
num = 6
Add(num)
txtBox.Text = CStr(num)
End Sub
Sub Add(ByRef num As Integer)
Dim var1, var2 As Integer
num = var1 + var2
End Sub
```
(A) 0
(B) 12
(C) 6
(D) None of the above
(A) 0
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