证券投资基金是一种短期投资工具，其主要功能是分散投资，降低投资单一证券所带来的个别风险。（）

Originally introduced by Netscape Communications, (1) are a general mechanism which HTTP Server side applications, such as CGI (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) .

1（）

A.fixed

B.flexible

C.stable

D.stateless