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.
Take context from the input text and decide on the accurate relationship between 'Volvo' and 'Truck' from the options provided.
Options: product/material produced, founded by, owner of, brand