Apple just poured more fuel on speculation that it's working on a car.
Confronted by a shareholder on Wednesday at a rare public forum over where Apple is looking to invest its cash, Jeff Williams, Apple's senior vice president of operations, seemed to suggest the automotive industry.
"The car is the ultimate mobile device, isn't it?" Williams said during the Re/code conference in Rancho Palos Verdes, California. Pressed further by Re/code co-founder Walt Mossberg, Williams appeared to pull back a little, addressing the importance of Apple's in-car information and entertainment system, CarPlay.
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"We're exploring a lot of different markets," Williams said.