窗体上有一个名称为Text1的文本框和一个名称为Command1的命令按钮。要求程序运行时，单击命令按钮，就可以把文本框中的内容写到文件out.txt中，每次写入的内容附加到文件原有内容之后。下面能够实现上述功能的程序是

A. Private Sub Command1_Click()
B. Open "out.txt" For Input As #1
C. Print #1, Text1.Text
D. Close #1
End Sub
F. Private Sub Command1_Click()
G. Open "out.txt" For Output As #1
H. Print #1, Text1.Text
I. Close #1
J. End Sub
K. Private Sub Command1_Click()
L. Open "out.txt" For Append As #1
M. Print #1, Text1.Text
N. Close #1
O. End Sub
Private Sub Command1_Click()
Q. Open "out.txt" For Random As #1
R. Print #1, Text1.Text
S. Close #1
T. End Sub