From an Epidemiology Perspective the Severity of an Injury Is

From an epidemiology perspective the severity of an injury is defined by the amount of 'time lost'. What are the classifications of injury severity in terms of time lost?

A) Minor (one to seven days) , moderately serious (eight to 21 days) or serious (21 or more days or permanent damage)
B) Minimal (24 - 48 hours) , serious (72 hours - 8 days) or catastrophic (8 days +)
C) Minor (0 days) , moderately serious (1-7 days) , serious (8-21 days)
D) Grade I (1-7 days) , Grade II (8-21 days) , Grade III (6 weeks to 1 year)