Which retail innovation did Apple introduce in 2001 that fundamentally changed electronics retail and has been widely copied by competitors?

In the competitive landscape of consumer electronics retail, Apple revolutionized the shopping experience with its distinctive store design and customer engagement model. The company's approach to retail transformed how premium products are sold and experienced by consumers. This trivia question explores a pivotal aspect of Apple's retail strategy that changed the industry landscape and has since been widely adopted by other premium retailers.

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The Genius Bar, offering in-store technical support and personalized customer service
The minimalist store layout with products displayed on wooden tables without packaging
The elimination of traditional checkout counters in favor of mobile POS systems
The appointment-based shopping system to control store traffic and enhance customer experience