In ancient Rome, what specialized retail design feature was implemented in the macellum (food market) to preserve perishable goods in hot weather?

Step back in time to explore the fascinating world of ancient retail operations! Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated commercial systems that shaped their economies and daily lives. This poll challenges your knowledge about how our ancestors conducted business, organized their marketplaces, and established the foundations of retail practices that still influence commerce today. Test your understanding of these historical retail innovations!

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Underground cold storage chambers connected to aqueducts
Rotating wooden shelves that could be turned away from sunlight
Salt-lined display cases with replaceable ice blocks
Ventilated clay containers with evaporative cooling systems