Which of these revolutionary products was rejected by HP when its creator (who was an employee there) proposed developing it, only to later become the foundation of a trillion-dollar company?

Some of the world's most successful products weren't overnight sensations. Many faced skepticism, rejection, or even ridicule before becoming household names. This trivia question explores a famous product that initially faced significant hurdles before revolutionizing its industry. Test your knowledge about the challenging beginnings of iconic innovations!

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The personal computer (proposed by Steve Wozniak)
The digital camera (proposed by Steven Sasson)
The smartphone touchscreen (proposed by Jeff Han)
The online search algorithm (proposed by Larry Page)