Which of the statements about the effect of carbon dioxide concentration on the concentrations of glycerate 3-phosphate (GP), ribulose bisphosphate (RuBP), and triose phosphate (TP) is/are correct?

1. At low carbon dioxide concentration, the concentration of RuBP increases because less RuBP is converted into GP.
2. At low carbon dioxide concentration, the concentration of GP decreases because less carbon dioxide is fixed to RuBP.
3. At high carbon dioxide concentration, the concentration of GP decreases because the rate of its conversion to TP exceeds the rate of carboxylation.