In what was then the largest environmental enforcement case in U.S. history, companies including industry leaders Caterpillar Inc., Cummins Engine Co., Mack Trucks and Volvo Truck Corp. agreed to pay $83.4 million in fines and reprogram the computers.
Refer to the input text as context and select the correct relationship between 'Mack Trucks' and 'Truck' from the available options.
Options: distribution format, founded by, business division, product/material produced