To answer this question, you need to understand the different types in Java servlets and their methods.
Let's go through each option to understand which types define the methods getAttribute() and setAttribute():
Option A) HttpSession - This option is correct. The HttpSession interface in Java servlets defines the methods getAttribute() and setAttribute(). These methods are used to get and set attributes associated with a session.
Option B) ServletRequest - This option is correct. The ServletRequest interface in Java servlets also defines the methods getAttribute() and setAttribute(). These methods are used to get and set attributes associated with a specific request.
Option C) ServletResponse - This option is incorrect. The ServletResponse interface does not define the methods getAttribute() and setAttribute(). This interface is used to send response data back to the client.
Option D) ServletContext - This option is correct. The ServletContext interface in Java servlets defines the methods getAttribute() and setAttribute(). These methods are used to get and set attributes associated with the entire web application.
Option E) ServletConfig - This option is incorrect. The ServletConfig interface does not define the methods getAttribute() and setAttribute(). This interface is used to provide configuration information to a servlet.
Option F) SessionConfig - This option is incorrect. There is no built-in type called SessionConfig in Java servlets.
The correct answers are A, B, and D. These options define the methods getAttribute() and setAttribute().
Therefore, the correct answer is A, B, and D.