Pat will walk from intersection X to intersection Y along a route that is confined to the square grid of four streets and three avenues shown in the map above. How many routes from X to Y can Pat take that have the minimum possible length

在Windows 98网络环境下，用户无法直接将下列( )资源设置为共享资源。

A．文件

B．文件夹

C．光盘驱动器

D．打印机