What mechanisms are used by a Servlet Container to maintain session information?

What mechanisms are used by a Servlet Container to maintain session information?,Java, C ,C++, ASP, ASP.net C# ,Struts ,Questions & Answer, Struts2, Ajax, Hibernate, Swing ,JSP , Servlet, J2EE ,Core Java ,Stping, VC++, HTML, DHTML, JAVASCRIPT, VB ,CSS, interview ,questions, and answers, for,experienced, and fresher

 The mechanisms used by a Servlet Container to maintain session information : 

a) Cookies

b) URL rewriting

c) Hidden form fields

d) SSL (using HTTPS protocol) Sessions

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