What RADIUS alternative is commonly used for Cisco network gear and supports twofactor authentication?

Alice has a picture-based password system, where she has each user pick a set of their 20 favorite pictures, say, of cats, dogs, cars, etc. To login, a user is shown a series of pictures in pairs—one on the left and one on the right. In each pair, the user has to pick the one that is in his set of favorites. If the user picks the correct 20 out of the 40 he is shown (as 20 pairs), then the

system logs him in. Analyze the security of this system, including the size of the search space. Is it more secure than a standard password system? What will be an ideal response?

On a Macintosh platform, you append the ____ carriage return escape sequence to the end of the line.

A. \n B. \r C. \rn D. \nr