Which of the following best describes a sandbox?

The best description of a sandbox is indeed an isolated space where untested code and experimentation can safely occur separate from the production environment. This concept is fundamental in software development and security as it allows developers and security professionals to test new code, features, or applications without risking the stability or security of the live production environment.

In a sandbox, developers can freely modify and run applications in isolation, ensuring that their testing processes do not affect users or existing systems. This isolation is crucial for ensuring that any potential bugs, errors, or security vulnerabilities within the untested code cannot have unintended consequences on the larger system.

The context of other options highlights why they do not accurately describe a sandbox. While some might suggest that a sandbox could also protect transactions from malicious software or execute malicious code, these functions are not the primary focus of a sandbox. Rather, a sandbox's main purpose is to create a safe testing environment away from the main operational systems. Thus, the original definition emphasizes the isolation and separate nature of a sandbox, making it an essential tool in managing development and security processes effectively.