A Firm Provides a Directive to All Their Truck Drivers

A firm provides a directive to all their truck drivers to not exceed a speed of 60 miles per hour (mph) ,even if a higher speed is permitted by law.Although this would probably mean that delivery commitments are missed,it also results in an optimal use of fuel.This is an example of a

A) cost-to-cost trade-off.
B) modal trade-off.
C) cost-to-service trade-off.
D) None of the above