Which of the statements about factors affecting the rate of photosynthesis is/are correct?

1. At high light intensities, the rate of photosynthesis plateaus because another factor, such as temperature or carbon dioxide concentration, becomes the limiting factor.
2. In commercial greenhouses, paraffin heaters are sometimes used because burning paraffin increases both the temperature and the carbon dioxide concentration.
3. The light-independent stage of photosynthesis is more sensitive to temperature changes than the light-dependent stage because it relies on enzyme-controlled reactions.