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?（）

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

You have recently completely creating a new application for Certkiller .com.
This new application has to load an instance of the Inventory class from a large file named Inventory.dat.
You need to ensure that the application executes the loading process in as little time as possible.
What should you do?（）