Regarding the passing of Level 6 in a class, Which of the following statements are made: (1) the class leader passed; (2) everyone in the class passed; (3) some people passed: (4) some people did not pass. After a detailed investigation, it was found that only two of the above conclusions were correct. ["Someone in this class passed, but others didn't.", 'The monitor passed.', 'Everyone passed.', 'No one passed.']