C.  AJAX can update interface elements 'on the fly'
•How can users know what is happening when parts of the UI are refreshed?
Screen readers typically read in a linear fashion - When UI changes happen, the user may not be aware of this and new content may not be read
•to allow dynamic interface changes to be accessible, the application must:
–1. Alert the user that a change has occurred
–2. Allow direct access to the new content
–3. Then allow continued functionality of the web application.
•Most AJAX applications can be designed to do this...