单击命令按钮时，下列程度段的执行结果为( )。 Pfivate Sub Command1_Click() Dima As Integer，b As Integer, c As Integera=2:b=4:c=6Call S1(a，b)Print "a="；a；"b="；b；"c="；cCall S2(a，b)Print "a="；a；"b="；b；"c="；c； End Sub Private Sub S1(x As Integer, y As Integer) Dim c As Integerx=2*x:y=y+2:c=x+y End Sub Sub S2(x As Integer, By Val y As Integer) Dim e As Integerx=2*x:y=y+2:e=x+y End Sub
A．a=4 b=6 c=6 a=4 b=6 c=6
B．a=8 b=6 c=6 a=8 b=6 c=6
C．a=4 b=6 c=6 a=8 b=6 c=6
D．a=8 b=6 c=6 a=4 b=6 c=6
