Correct Response: A. One type of trojan, called a game-thief trojan, is a piece of malware that, when installed, steals a user's game account information. This can result in "unexplained activity and purchases in their online gaming account." B, C, and D are incorrect because a trojan is different from a worm program (B), which automatically spreads copies of itself between computers, a direct denial-of-service attack (C), where thousands of computers from around the world send traffic to a website thousands of times per second shutting out legitimate users and crashing the website, or a social engineering attack (D), which exploits human psychology to trick people into handing over sensitive information.
