Dan Kieffer of PACCAR Inc., speaking for a group of heavy-duty North American truck manufacturers including Volvo and Daimler, said, “Unnecessarily stringent engine standards will only exacerbate today’s trend of delaying new truck purchases,” and consequently keep older, not-as-clean trucks on the road.
In the context of the input sentence, determine the relationship between 'PACCAR' and 'truck'.
Options: distributed by, director/manager, owned by, product/material produced