How do you create a radio button in a form?

To create a radio button in a form, you use the <input> element with the attribute type set to radio. This type of input allows users to select only one option from a group of choices, ensuring that the form enforces a single selection. Each radio button should share the same name attribute to group them together, which alerts the browser that only one in that group can be selected at a time.

The other options do not serve this purpose: a checkbox allows multiple selections, a button type does not apply to radio buttons at all, and an input type of button simply creates a clickable button rather than a selection mechanism. Thus, using <input type="radio"> is the correct way to implement radio buttons in forms, ensuring that each radio button functions correctly for selecting a single option among a defined set.