单项选择题 Certkiller .com has asked you to create a file management application to monitor the hosts file. Certkiller .com has instructed you to change the hosts file if it has been changed. You, therefore, need to display the size and whether the hosts file is set to read-only. What should you do?（）

单项选择题 Certkiller.com has asked you to create an application to display all of the top directories based on the drive path.You need to ensure that the application displays the number of files within top-level directories.What should you do?（）

单项选择题 Certkiller .com has asked you to develop an application that displays the properties for all Certkiller.coms network drives. The information generated by this application will be utilized by Certkiller .coms network administrators to verify client setups. You need to ensure that these requirements are fully satisfied. What should you do?（）