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Which of the following statements correctly describes the air pressure differences and air pressure dynamics among the outside, the anteroom, and the cleanroom?
• Air pressure in the anteroom and the cleanroom is equally positive but more positive than in the outside.
• Air pressure in the anteroom is more positive than that of the outside and the cleanroom.
• Air pressure in the anteroom is more positive than that of the outside but less positive than that of the cleanroom.
• Air pressure in the anteroom pushes anteroom air to the outside and also back into the cleanroom.