Which identifies a drawback to consider when adopting an AJAX model to improve user experience?

Your CMC wants to move several web based search applications to an AJAX model, hoping to
improve user engagement with a browser experience that feels smaller and more responsive.

Which identifies a drawback to consider when adopting an AJAX model to improve user
experience?

A.
Maintaining current performance could require more hardware.

B.
Maintaining accessibility across clients may require more development.

C.
Maintaining security within the page could be more difficult.

D.
Maintaining page navigability for users would have to be re-evaluated.

E.
Maintaining a scalable system could require redesigning applications.