To answer this question, we need to understand what a session ID is and its maximum length.

A session ID is a unique identifier assigned to each user session in a web application. It is used to track and identify the user's session. The length of a session ID can vary depending on the implementation and requirements of the web application.

Option A) 4K - This option is correct because it states that the maximum length of the session ID is 4K. In computer science, K represents 1024, so 4K would be 4 * 1024 = 4096 characters.

Option B) 2K - This option is incorrect because it states that the maximum length of the session ID is 2K, which is less than the correct answer.

Option C) 6K - This option is incorrect because it states that the maximum length of the session ID is 6K, which is greater than the correct answer.

Option D) None of the above is correct - This option is incorrect because option A is the correct answer.

Therefore, the correct answer is A) 4K. The maximum length of the session ID is 4K, which is 4096 characters.

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To answer this question, we need to understand the purpose and behavior of each method in the context of a servlet.

Option A) doPost() - This method is used to handle HTTP POST requests in a servlet. It is a standard method that can be overridden to provide custom functionality. Calling this method does not cause unpredictable results.

Option B) doGet() - This method is used to handle HTTP GET requests in a servlet. It is also a standard method that can be overridden. Calling this method does not cause unpredictable results.

Option C) System.out.println() - This method is used to print output to the console. It is not specific to servlets and does not cause unpredictable results in the context of a servlet.

Option D) System.exit(0) - This method is used to terminate the Java Virtual Machine (JVM) and exit the program. Calling this method within a servlet can cause unpredictable results because it abruptly terminates the execution of the servlet container, which may impact the ongoing processing of other requests and lead to unexpected behavior.

Therefore, the correct answer is D) System.exit(0). This option is correct because calling this method within a servlet can cause unpredictable results.

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