Take context from the input text and decide on the accurate relationship between 'iPhone' and 'Apple Inc' from the options provided.
Options: subsidiary, manufacturer, owner of, position held

BENGALURU/SAN FRANCISCO (Reuters) - Apple Inc (AAPL.O) shares slumped nearly 7 percent in after-hours trading as its fourth-quarter revenue forecast fell short of estimates and it missed some targets for iPhone sales.
manufacturer