在窗体中添加一个通用对话框Commondialog1和一个命令按钮Command1,当单击按钮时,打开颜色对话框,能实现此功能的程序段是
A.Private Sub Command1_Click( ) Commondialog1.ShowOpen End Sub B.Private Sub Command1_Click( ) Commondialog1.ShowColorEnd Sub C.Private Sub Command1_Click( ) Commondialog1.ShowOpen Commondialog1.ShowFontEnd Sub D.Private Sub Command1_Click( ) Commondialog1.ShowColor Commondialog1.ShowHelp End Sub