Take context from the input text and decide on the accurate relationship between 'Glencore' and 'mining' from the options provided.
Options: publisher, subsidiary, industry, brand

In fact, while Lookers and Pendragon are very much worth buying at the present time, the mining sector looks massively undervalued and, as such, the likes of Rio Tinto and Glencore appear to be better options for long term investors.
industry