Which of the following highlights the assessment of learning?

• A. The teacher assesses the performance of one student in comparison to the performance of another.
• B. Apart from paying attention to the thinking processes of the students, the teacher also assesses their conceptual understanding.
• C. The teacher assesses the students' answers by comparing them with the standard answers.
• D. The teacher assesses the students on the basis of the information given in the text books.