What does Mobile Code typically do?

Mobile code typically refers to programs or scripts that can be transferred from one computer to another and executed there without the user's explicit consent or knowledge. This characteristic allows mobile code to move through networks or over the internet, enabling it to interact with various applications on the host system.

The correct choice indicates that mobile code primarily infects applications as it travels across different devices, highlighting its ability to execute and manipulate programs regardless of the originating source. This can lead to various security risks, such as the introduction of malware or exploitation of vulnerabilities in applications, which is why understanding mobile code's behavior is crucial in the context of cybersecurity and information systems.

In contrast, other options reflect more limited or specific actions that mobile code does not typically engage in. Infecting specific user accounts, targeting only web applications, and creating backdoor access represent narrower scenarios rather than the broad capability of mobile code to traverse and affect multiple applications across different systems.