One Police Officer Decides to Pull Over Drivers Going 20

One police officer decides to pull over drivers going 20 kilometres per hour (km/h) over the speed limit.To make his quota,another police officer decides to pull over drivers going 10 km/h over the limit.Who is being fairer?

A) Both are since this range is the typical "grace" allowed to motorists.
B) Neither.Both should enforce the posted speed limit.
C) It depends on road conditions.
D) Fairness is not the issue when both officers interpret the law arbitrarily.