Which of the following JSP variables are not available within a JSP expression. Select the one correct answer.
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out
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session
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request
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response
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httpsession
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page
JSP provides implicit objects like out, request, response, session, and page that can be used directly in expressions. 'httpsession' is not a valid JSP implicit variable - the session object itself is an HttpSession, not a variable called 'httpsession'. Options A, B, C, D, and F are all standard implicit objects available in JSP expressions.
To answer this question, we need to understand the different JSP variables and their availability within a JSP expression.
Option A) out - This option is correct because the out variable is available within a JSP expression. It represents the JspWriter object and is used to send output to the response.
Option B) session - This option is correct because the session variable is available within a JSP expression. It represents the HttpSession object and is used to store and retrieve session-specific data.
Option C) request - This option is correct because the request variable is available within a JSP expression. It represents the HttpServletRequest object and is used to retrieve information about the client's request.
Option D) response - This option is correct because the response variable is available within a JSP expression. It represents the HttpServletResponse object and is used to send response back to the client.
Option E) httpsession - This option is incorrect because the httpsession variable is not available within a JSP expression. There is no standard JSP variable named httpsession available.
Option F) page - This option is correct because the page variable is available within a JSP expression. It represents the current JSP page and is used to access page-specific information and methods.
The correct answer is E) httpsession. This option is incorrect because the httpsession variable is not available within a JSP expression.