(单选题)10: 在窗体中添加一个通用对话框，其名称为CommonDialog1，然后添加一个命令按钮。要求单击命令按钮时，打开一个打开文件的通用对话框。该窗口的标题为“打开”，在文件类型框中显示的是TextFiles(*.txt)。则能够满足上述要求的程序是（ ）
A: "Private Sub Command1_Click()CommonDialog1.Flags = cdlOFNHideReadOnlyCommonDialog1.Filter = ""allfiles(*.*)|*.*|textfiles"" & ""(*.txt)|*.txt|Batchfiles(*.bat)|*.bat""CommonDialog1.FilterIndex = 1CommonDialog1.ShowOpenMsgBox CommonDialog1.FileNameEnd Sub"
B: "Private Sub Command1_Click()CommonDialog1.Flags = cdlOFNHideReadOnlyCommonDialog1.Filter = ""allfiles(*.*)|*.*|textfiles"" & ""(*.txt)|*.txt|Batchfiles(*.bat)|*.bat""CommonDialog1.FilterIndex = 2CommonDialog1.ShowOpenMsgBox CommonDialog1.FileNameEnd Sub"
C: "Private Sub Command1_Click()CommonDialog1.Flags = cdlOFNHideReadOnlyCommonDialog1.Filter = ""allfiles(*.*)|*.*|textfiles"" & ""(*.txt)|*.txt|Batchfiles(*.bat)|*.bat""CommonDialog1.FilterIndex =1CommonDialog1.ShowSaveMsgBox CommonDialog1.FileNameEnd Sub"
D: "Private Sub Command1_Click()CommonDialog1.Flags = cdlOFNHideReadOnlyCommonDialog1.Filter = ""allfiles(*.*)|*.*|textfiles"" & ""(*.txt)|*.txt|Batchfiles(*.bat)|*.bat""CommonDialog1.FilterIndex = 2CommonDialog1.ShowSaveMsgBox CommonDialog1.FileNameEnd Sub"
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