To answer this question, we need to understand the methods available in the HttpServletResponse class for setting the content type.
Let's go through each option to understand why it is correct or incorrect:
Option A) setType - This option is incorrect because there is no method named "setType" in the HttpServletResponse class.
Option B) setContent - This option is incorrect because there is no method named "setContent" in the HttpServletResponse class for setting the content type.
Option C) setContentType - This option is correct because the HttpServletResponse class does have a method named "setContentType" that can be used to set the content type.
Option D) setResponseContentType - This option is incorrect because there is no method named "setResponseContentType" in the HttpServletResponse class.
The correct answer is option C) setContentType. This option is correct because the setContentType method is defined in the HttpServletResponse class and is used to set the content type.