What are the potential risks associated with excessive consumption of creatine?

I- Hemochromatosis.
II- Nausea.
III- Gastritis.
IV- Muscle cramps.
V- Renal damage.
VI- Increased risk of cancer.
a) I, II, III, IV, V and VI are correct.
b) I, II, III, IV and V are correct.
c) II, III, IV and V are correct.
d) II, III and IV are correct.
e) III and IV are correct.