Take context from the input text and decide on the accurate relationship between 'Walter Energy' and 'coal' from the options provided.
Options: distributed by, owned by, product/material produced, business division

Walter Energy Inc. (WLTGQ), with its restructuring deal in pieces, pleaded with a reluctant bankruptcy judge Thursday for a new cash order that would appease its lenders and grant the coal company 30 days to reset.
product/material produced