j2ee certificate ques (SingleThreadModel)

[singh santosh]

hi ,

  Given that a servlet implements the SingleThreadModel inteface, which of the following statements are true? [Check all correct answers]
 
1. The servlet is guaranteed to be thread-safe.
2. The servlet container guarantees that no two threads will execute concurrently in the servlet's service method.
3. The servlet container may synchronize access to a single instance of the servlet.
4. The servlet container may create multiple copies of the servlet and dispatch each request to the different servlets.
 
ans  :)  2,3,4  

doubts:
option 3:y they talk about 2 threads when there will be only one and when no second thread exist for the SingleThreadModel for a instance of sevlet..

Please clarify..

regards
-santosh
[ July 15, 2006: Message edited by: singh santosh ]