单项选择题 While installing an application， the administrator is instructed to perform two final tasks prior to starting the application：   1.Set the ownership of a file named ’control_file’ to be owned by the user ’database’ and the group ’appsrvr’.   2.Change the permissions of ’control_file’ to 0766.   After these two tasks have been completed， what will the file permissions look like when ’ls -l control_file’ is executed？（）

单项选择题 Asystemadministratorwantstogivefullread/write/excuteaccesstotheownerandgroupofthe/stuffdirectoryandallsubdirectoriesandfiles，butonlyallowread/executeforothers.Whatcommandwouldtheadministratoruse？（）

单项选择题 A user reports that they cannot cd to /tmp/application. A system administrator entered the following command：   （1）ls -ld /tmp/application   （2）drw-r--r-- 4 root system 512 Jan 15 14：09 application   What is the most likely cause of the problem？（）