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.