What is the current RDA for protein for healthy adults expressed in grams per kilogram of body weight per day?

1.6 grams per kilogram of body weight per day

Approximately 1.2 grams per kilogram of body weight per day, which some experts suggest for more active people and is sometimes proposed as a higher recommendation

0.8 grams per kilogram of body weight per day

0.5 grams per kilogram of body weight per day