How Do CAM Plants Minimize Photorespiration

How do CAM plants minimize photorespiration?

A) The light reactions and carbon reactions occur in different cells, so carbon dioxide does not come into contact with rubisco.
B) The light reactions and carbon reactions occur in different cells, so oxygen does not come into contact with rubisco.
C) Stomata are only opened at night, storing carbon dioxide in malate. During the day the carbon dioxide is released for photosynthesis.
D) Stomata are only opened at night, storing oxygen in malate. During the day the oxygen is released for photosynthesis.