執行下列Visual Basic程式片段後，變數Sum的值為何？
Dim Sum, Maximum, i As Integer
Sum=0: Maximum = 5
Do While Maximum 大於 0
For i=Maximum To 5 Step 2
Sum = Sum + 1
Next i
Maximum = Maximum - 1
Loop
(A) 4 (B) 6 (C) 9 (D) 12
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https://www.youtube.com/watch?v=kv9rE8ujQ2U