在运行阶段，要在文本框Text1获得焦点时选中文本框中所有内容，对应的事件过程是( )。

A) Private Sub Text1_GotFocus()
Text1.SelStart=0


Text1.SelLength=Len(Text1.Text)
End Sub
B) Private Sub Text1_LostFocus()
Text1.SelStart=0
Text1.SelLength=Len(Text1.Text)
End Sub
C) Private Sub Text1_Change()
Text1.SelStart=0
Text1.SelLength=Len(Text1.Text)
End Sub
D) Private Sub Text1_SetFocus()
Text.SelStart=0
Text1.SelLength=Len(Text1.Text)
End Sub