+--------+------------+-----------+-------------------+------------+--------+
| userID | first_name | last_name | email             | password   | points |
+--------+------------+-----------+-------------------+------------+--------+
|      1 | Jhon       | Jhonny    | jhon@yahoo.com    | secretPass |      0 |
|      2 | Dan        | Dan       | dan@yahoo.com     | 1234       |      0 |
|      3 | Dick       | Pop       | dd@yahoo.com      | 123456     |      0 |
|      4 | Mihaela    | Micky     | mihaela@yahoo.com | pass12     |      0 |
+--------+------------+-----------+-------------------+------------+--------+

+------------+--------------------------------------------------+---+---+---+---+
| questionID | question                                         | a | b | c | d |
+------------+--------------------------------------------------+---+---+---+---+
|          1 | which of these are colors?                       | 1 | 0 | 0 | 1 |
|          2 | which of these are fruits?                       | 1 | 1 | 1 | 0 |
|          3 | which of these are programming language?         | 0 | 1 | 1 | 0 |
|          4 | What is IPv6?                                    | 0 | 0 | 0 | 1 |
+------------+--------------------------------------------------+---+---+---+---+

+------------+--------+---+---+---+---+
| questionID | userID | a | b | c | d |
+------------+--------+---+---+---+---+
|          1 |      1 | 1 | 1 | 0 | 0 |
|          2 |      1 | 1 | 1 | 1 | 0 |
|          1 |      3 | 1 | 0 | 1 | 1 |
|          1 |      4 | 1 | 1 | 1 | 0 |
|          3 |      1 | 1 | 0 | 1 | 1 |
|          4 |      1 | 1 | 0 | 1 | 1 |
|          1 |      2 | 1 | 1 | 0 | 0 |
|          2 |      2 | 0 | 1 | 0 | 1 |
|          3 |      2 | 0 | 1 | 1 | 1 |
|          4 |      2 | 1 | 1 | 0 | 1 |
|          2 |      3 | 1 | 0 | 0 | 1 |
|          3 |      3 | 1 | 0 | 1 | 1 |
|          4 |      3 | 1 | 0 | 1 | 1 |
|          2 |      4 | 0 | 1 | 1 | 1 |
|          3 |      4 | 1 | 0 | 0 | 1 |
|          4 |      4 | 0 | 0 | 1 | 0 |
+------------+--------+---+---+---+---+