设在工程中有一个标准模块，其中定义了如下记录类型：TyPe Record ID A3 IntegerName As String*20 End TyPe 在窗体中添加一个名为Command1的命令按钮，假设d：\F1.dat文件中含有5个用户自定义类型的记录。要求当执行事件过程Command1_Click时，随机访问该文件，并把文件中的第4条记录读出。下列能够完成该操作的程序段是
A．Private Sub Command1_Click( ) Dim MyRecord As Record，PositionOpen"d：\F1.dat"For Random As#1 Len=Len(My RecorPosition=4 Get#1，Position，MyrecordClose #1End Sub
B．Private Sub Command1_Click( )Dim MyRecord As Record，Position Open"d：\F1.dat"For Random As #1 Len=Len(MyRecorPosition=4Put #1，Position，MyRecordClose#1 End Sub
C．Private Sub Command1_Click( )Dim MyRecord As Record，PositionOpen"d：\F1.dar"For OutPut As #1 Len=Len(My RecorPosition=4Get #1，Position，MyRecordClose#1 End Sub
D．Private Sub Command1_Click( )Dim MyRecord As record，PositionOpen"d：\F1.dat"For lnput As #1 Len=Len(MyRecorPosition=4Get #1，Position，MyRecordClose#1End Sub
