Which of the following materials is required for marking answers during the exam?

The requirement for marking answers during the exam is met by the answer sheet. An answer sheet is specifically designed to record responses to questions in a standardized format. Typically, exams provide answer sheets that allow test-takers to fill in their answers with a specific marking tool, such as a pencil or pen, ensuring clarity and allowing for easy scanning or grading.

The use of answer sheets helps in organizing responses and can accommodate features like multiple-choice answers or written responses based on the format of the exam. The design of the answer sheet often aligns with the requirements of the testing process, making it essential for the exam's integrity.

In contrast, while whiteboards, graph paper, and scratch paper might be useful for calculations or notes, they do not serve the purpose of officially recording answers for evaluation in the same way that an answer sheet does. Thus, the answer sheet is the required material for marking answers during the exam.