Which of the following statements are true of the kidneys and acid-base balance? (Read carefully and select all of the correct statements.)

A)If body fluids become too acidic, the kidneys will secrete H⁺ ions into the renal filtrate.
B)Kidney cells can obtain H⁺ ions from the reaction of CO₂ and H₂O to form carbonic aciD.
C)The bicarbonate buffer system is a mechanism for the kidneys to get rid of excess H⁺ ions and thereby lower the pH of body fluids.
D)The kidneys help maintain the normal pH range of blood of 7.30 to 7.40.