Which geographic region first introduced the concept of 'pop-up retail stores' as a mainstream retail innovation strategy?

In the world of retail, geography plays a crucial role in how products are developed and delivered. Some regions have pioneered retail innovations that transformed global shopping experiences. This trivia challenges you to identify which geographic region first implemented a revolutionary retail concept that changed how consumers interact with products and spaces. Test your knowledge of retail innovation history across different regions of the world!

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Japan (specifically Tokyo's Harajuku district in the late 1990s)
United States (specifically SoHo, New York in the early 2000s)
United Kingdom (specifically London's Carnaby Street in 2002)
Scandinavia (specifically Copenhagen's design district in 1999)