Which retailer holds the Guinness World Record for the largest individual store by retail floor space?

Retail space is a crucial aspect of market dominance. Some retailers have taken this to extreme levels, creating shopping destinations of truly record-breaking proportions. This trivia question challenges your knowledge about which retail chain holds the Guinness World Record for the largest individual store by retail floor space. Think about the massive retail experiences you've encountered or heard about - which one tops them all in sheer size?

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IKEA (Gwangmyeong, South Korea)
The Dubai Mall (Dubai, UAE)
Shinsegae Centum City Department Store (Busan, South Korea)
Mall of America (Minnesota, USA)