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

单项选择题 An administrator performs a full backup every Saturday evening and daily incremental backups the  rest  of  the  week.  The  system  failed  on  Thursday  and  must  be  restored.   Which  backup  tapes  will  be  required to restore the system to its most recent recoverable state（）

单项选择题 Howcanadirectorynamed/dirlbeexcludedduringarestoreoffilesbackedupbynamewiththebackupcommand（）