What is assigned to lblDisplay.Text when the following code executes?
```
Dim intNumber As Integer = 4
AddOne(intNumber, 6)
lblDisplay.Text = intNumber
' Code for AddOne
Public Sub AddOne(ByVal intFirst As Integer, ByVal intSecond As Integer)
intFirst += 1
intSecond += 1
End Sub
```
a. 4
b. 5
c. 6
d. 7
a. 4
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