Take context from the input text and decide on the accurate relationship between 'DFS' and 'furniture' from the options provided.
Options: owned by, director/manager, position held, product/material produced

2015 has been a positive year thus far for investors in potash exploration company Sirius Minerals (LSE: SXX), support services contractor Balfour Beatty (LSE: BBY) and furniture seller DFS (LSE: DFS).
product/material produced