A woman gives birth to twins at 38 weeks' gestation. The first twin weighs 2800 g (6 lb, 3 oz) and has a hematocrit of 70%; the second twin weighs 2100 g (4 lb, 10 oz) and has a hematocrit of 40%. Which of the following statements is correct?
a) The first twin is at risk for polycythemia
b) The second twin is at risk for hyperviscosity
c) Both twins are at risk for hyperviscosity
d) Both twins are at risk for anemia