Which of the following describes a Trojan Horse?

A Trojan Horse refers to a type of malicious program that disguises itself as legitimate or useful software to deceive users. The term originates from the ancient Greek story in which a deceptive wooden horse allowed soldiers to infiltrate a city by hiding within it. Similarly, a Trojan Horse in the context of computer security appears benign but can carry harmful payloads or open backdoors for unauthorized access.

In this context, the nature of a Trojan Horse is to manipulate user trust by appearing as a helpful application. For instance, it might be presented as a game, utility, or system optimization tool. Once the user installs it, the Trojan can execute malicious actions, such as stealing personal information, corrupting files, or allowing remote access to an attacker.

The other options, while related to software, do not accurately reflect the characteristics of a Trojan Horse. For example, software that cleans your computer of viruses would be classified as antivirus software, which is designed to protect rather than harm. Averages system performance would refer to performance monitoring tools, which analyze system capabilities, rather than a malicious intent. Similarly, software designed to speed up your computer would also be aimed at improvement and optimization, not deception or corruption. Therefore, choosing the description of a Trojan Horse as a malicious