为了使一个窗体从屏幕上消失但仍在内存中，所使用的方法或语句为( )。

A．Sub Command1_click()
Dimstudent As Stutype
With student
.ino=12
.strname=smith
.strsex=男
.smark=89
End With
End Sub
B．Sub Command1_Click()
Dim student As Stutype
With student
.ino=12
.strname="smith"
.strsex="男"
.smark=89
End With
End Sub
C．Sub Command1_Click()
Dim student As Stutype
With Stutype
.ino=12
.strname="smith"
.strsex="男"
.smark=89
End With
End Sub
D．Sub Command1_click()
Dim student As Stutype
With student
.ino=12
.strname="smith"
.strsex="男"
.smark=89
End student
End Sub

A．