01 An online form shows no confirmation after submission. The user cannot know whether the information was received. Which element is missing?
Answer and explanation
Correct answer: B. Feedback
Explanation: A confirmation or acknowledgement tells the sender what happened after submission, so it functions as feedback from the system. Without it, the user cannot verify successful receipt and may submit repeatedly or remain uncertain. The form still has a sender, message, and encoding; the missing element is the response indicating the result.