What will be displayed by the following program when the button is clicked?

Private Sub btnDisplay_Click(...) Handles btnDisplay.Click

Dim a As String, n, c As Integer

a = "HIGHBACK"

n = CInt(Int(a.Length / 3))

c = 0

For k As Integer = 0 To n 1 I

f a.Substring(k, 1) > a.Substring(7 k, 1) Then

c += 1

End If

Next

txtBox.Text = CStr(c)

End Sub

Answer.

A. 1

B. 2

C. 3

D. 4

E. 5