Mechanical performance refers to the use of mechanical equipment for the public performance of the performance of a work, and does not include the public screening of films and the dissemination of works through broadcast. According to the above definitions, Which of the following behaviors are mechanical performance behaviors:. ['A supermarket uses a TV to play songs stored in the computer publicly.', 'Art Museum C publicly displays a large number of calligraphy and photography works.', 'Ding shopping mall publicly reproduces movies stored on the computer through a slide projector.', 'Radio B is simultaneously broadcast on the Internet at the same time as the radio program is broadcast.']