有如下程序代码: Option Base 1 Private Sub Command1_Click() Dim arr Dim start As Integer, finish As Integer Dim sum As Integer arr = Array(12, 4, 8, 16) start = LBound(arr) finish = UBound(arr) sum = 0 For i = start To finish sum = sum + arr(i) Next i c = sum / finish Print c End Sub 运行程序后,窗体上输出的内容为( )