A square countertop has a square tile inlay in the center, leaving an untiled strip of uniform width around the tile. If the ratio of the tiled area to the untiled area is 25 to 39, which of the following could be the width, in inches, of tile strip
Ⅰ.1
Ⅱ.3
Ⅲ.4

A．Ⅰ only

B．Ⅱ only

C．Ⅰ and Ⅱ only

D．Ⅰ and Ⅲ only

E．(E) Ⅰ, Ⅱ, and Ⅲ

在以下供选择的操作中，File对象能够提供的操作是( )

A．删除文件
B．读写文件
C．打开文件
D．查询文件属性