Which retail innovation was specifically developed for military museums in the 1990s that dramatically increased per-visitor spending and is now standard in most military heritage sites worldwide?

Throughout history, military museums and heritage sites have employed various retail strategies to engage visitors and preserve history through merchandise. This poll tests your knowledge of how military history is commercialized and the retail psychology behind military memorabilia and collectibles. Can you identify the correct retail innovation that revolutionized military museum gift shops?

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The 'Living History' experience package, where visitors could purchase bundles of replica items used by soldiers from specific battles
The 'Veterans' Discount Club,' a subscription model offering exclusive access to limited edition military collectibles
The 'Digital Battlefield' interactive kiosks allowing visitors to customize and order personalized military memorabilia
The 'Heritage Preservation Fund,' where a percentage of each purchase was visibly allocated to restoration projects