What is the recommended dietary allowance (RDA) for protein? Calculate the daily protein requirement for a 3-year-old, a 30-year-old, and a 60-year-old individual of different weights.
a. 0.8 g/kg/day
b. 1.0 g/kg/day
c. 1.2 g/kg/day
d. 1.5 g/kg/day