After a web page $($with HTML$,$ CSS$,$ and Javascript$)$ has been downloaded, select all items that can be done completely in the web browser without relying on any subsequent use of a web server.

Question $7$ Select one or more:

a$.$

dynamically updating content on the page

b$.$

dragging$-$and$-$dropping of items on the page

c$.$

uploading$/$downloading a file

d$.$

AJAX