A Radio button can be directly accessed from the keyboard using a . . . . . . . .

Access key
Shortcut key
Assigned key
Designated key

The correct answer is: A. Access key

An access key is a keyboard shortcut that allows users to access a specific control or function without using the mouse. Access keys are typically assigned to letters on the keyboard, and are often displayed next to the control or function they activate.

For example, in a web browser, the access key for the “Back” button is usually the left arrow key. To use the access key, press and hold the left arrow key, and then press the Enter key.

Access keys can be a helpful way to make your website or application more accessible to users with disabilities. For example, users who are unable to use a mouse can use access keys to navigate your website or application.

Here are some additional details about each option:

  • Shortcut key is a combination of keys that can be pressed to perform a specific action. For example, the shortcut key for copying text is Ctrl+C.
  • Assigned key is a key that has been assigned a specific function. For example, the Tab key is often assigned to the “Next” function.
  • Designated key is a key that is used to perform a specific action in a specific context. For example, the Enter key is often used to submit a form.