Final answer:
Radio buttons are designed to allow users to select a single option from a set of choices and are grouped logically in code, not just visually in a group box, to ensure this behavior.
Step-by-step explanation:
The subject here is related to User Interface (UI) design, specifically within the context of computer programming and software development. Radio buttons are a common element in form design used to allow users to select one option from a set of choices. When radio buttons are grouped within a group box on a form, users can select only one option within that group. However, if radio buttons are not grouped, the behavior you've described is not standard. Normally, even if radio buttons are not placed within a visual group box, they still need to be grouped logically to ensure that only one button can be selected at a time. This is typically handled in the code itself, where radio buttons that are meant to offer mutually exclusive options are given the same 'name' attribute in HTML, or are managed through similar mechanisms in other programming environments.