Which of the following RAID levels is supported by an operating system?

Rick works as a Computer Forensic Investigator for BlueWells Inc. He has been informed that some confidential information is being leaked out by an employee of the company. Rick suspects that someone is sending the information through email. He checks the emails sent by some employees to other networks. Rick finds out that Sam, an employee of the Sales department, is continuously sending text files that contain special symbols, graphics, and signs. Rick suspects that Sam is using the Steganography technique to send data in a disguised form. Which of the following techniques is Sam using?
Each correct answer represents a part of the solution. Choose all that apply.

John works as a professional Ethical Hacker. He is assigned a project to test the security of www.weare-secure.com. He enters a single quote in the input field of the login page of the We-are-secure Web site and receives the following error message:
Microsoft OLE DB Provider for ODBC Drivers error '0x80040E14'
This error message shows that the We-are-secure Website is vulnerable to __________.

Which model is a software development process combining elements of both design and prototyping-in-stages, in an effort to combine advantages of top-down and bottom-up concepts?

You have installed Windows Vista Home Premium on your home computer. The computer is connected to the Internet through an ADSL connection. You want to protect yourself from the traps of fraudulent sites. Which of the following features of Internet Explorer 7+ will you use?