Take context from the input text and decide on the accurate relationship between 'Petrobras' and 'gas' from the options provided.
Options: distribution format, chief executive officer, distributed by, product/material produced

But now, after about $250 billion of investment and the discovery of some of the world's largest offshore oil and gas resources, Petrobras is producing 2.8 million boepd, 20 percent less than its estimate for 2012 output.
product/material produced