What type of programs is the most common way for E-Business Web servers to interact dynamically with users?

What type of programs is the most common way for E-Business Web servers to interact
dynamically with users?

A.
4GL (client-side)

B.
4GL (server-side)

C.
DHTML (server-side)

D.
CGI (server-side)

E.
CGI (client-side)

F.
DHTML (client-side)