What is a common characteristic of mobile code?

Mobile code is characterized by its ability to be executed without explicit installation, which means it can run on a device or system without requiring traditional installation steps typically associated with software applications. This characteristic allows for greater flexibility and efficiency, as mobile code can be downloaded and executed on demand. Examples include Java applets, ActiveX controls, and scripts executed in browsers.

This execution model is significant because it enables developers to create applications that can be delivered over the internet and utilized across various platforms without needing to go through a cumbersome installation process. Users can simply access the code through a web browser or any appropriate execution environment, which promotes ease of use and versatility in deployment.

In contrast, the other characteristics mentioned do not universally apply to mobile code. While some mobile code may indeed be user-dependent or require server-side support, these are not defining traits. Additionally, mobile code is often designed to function over the internet, not limited to local networks. Therefore, the unique ability to execute without explicit installation stands out as a common characteristic of mobile code.