【单选题】

Originally introduced by NetscapeCommunications, (1) are a general mechanism which HTTP Server side applications, such asCGI (2) , can use to both store and retrieve information on the HTTP (2) side of the connection.Basically,Cookies can be used to compensate for the (4) nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based (5) .

A、programsB、applicationsC、frameworks D、constrains