The projection test refers to using some method to bypass the subject's psychological defense and detect their true thoughts when they are unprepared. In the actual test, the tester often gives the subject some vague stimuli and observes their These fuzzy stimuli respond to test conclusions. According to the above definition, which of the following is projection tests? ['In order to select the choir members, the teacher in the music class asked each student to sing a song.', 'The restaurant owner goes out temporarily and lets the customer put the money in the box at the counter by himself.', 'The examiner deliberately piled some scattered books at the entrance of the examination room before the candidates entered the interview.', 'Zhang wants to inspect a few young people and deliberately drops his wallet on his desk before leaving work.']