Originally introduced by Netscape Communications,___(66)___ are a general mechanism which HTTP Server side applications, such as CGI (67) , can use to both store and retrieve information on the HTTP ___(68)___ side of the connection. Basically, Cookies can be used to compensate for the ___(69)___ nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based ___(70)___ .
A．fixed
B．flexible
C．stable
D．stateless
