What is the relationship between 'Starbucks' and 'coffee' in the context of the input sentence.
Options: currency, director/manager, product/material produced, developer

They came back with classics like iPhone maker Apple ( NASDAQ:AAPL ) , e-commerce titan Amazon.com ( NASDAQ:AMZN ) , and coffee chain Starbucks ( NASDAQ:SBUX ) , all of which offer unique value right now.
product/material produced