Bốn Đáp Án - Quét thẻ ABCD

Four Answers - Scan the ABCD card Use the Camera to scan the answer card held up by the student.
Students in the classroom will be given a square card, printed in black and white, by the teacher.
The teacher asks a question with 4 answer options ABCD, the students will choose the answer by holding up the card.
The teacher uses a phone installed with BonDA to scan the answer card to know which answer option the student chose.