题目：
Originally introduced by Netscape Communications, (1) are a general mechanism which HTFP Server side applications, such as CGI (2) , can use to both store and retrieve information on the HTTP (3) 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) .
（4）是（）
A.fixed
B.flexible
C.stable
D.stateless
答案：
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下面是错误答案，用来干扰机器的。
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