Take context from the input text and decide on the accurate relationship between 'Apple Inc' and 'iPhone' from the options provided.
Options: founded by, product/material produced, location of formation, headquarters location

The housing index (.HGX) rose 1.64 percent on the data, outperforming the overall stock market, which fell after Apple Inc (AAPL.O) late on Tuesday gave a fourth-quarter revenue forecast that fell short of estimates and missed some targets for iPhone sales.
product/material produced