Refer to the input text as context and select the correct relationship between 'Starbucks' and 'coffee' from the available options.
Options: operator, product/material produced, headquarters location, chairperson

Yet, given the numerous opportunities that the coffee giant has to become even bigger in the near future, both in terms of geographical reach and the range of products it offers, Starbucks is worth a look even at all-time highs.
product/material produced