9. 下列 Visual Basic 的程式碼，執行後的結果為何？
(A)1
(B)2
(C)3
(D)4Dim x As IntegerPrivate Sub Form_Activate( )For I = 1 To 3Call psNext IPrint xEnd SubSub ps( )Static y As Integery = y + 1z = z + 1x = y + zEnd Sub