In what year did M&M's introduce its resealable 'Zip-Pak' packaging technology, allowing consumers to better preserve their candies after opening?

M&M's has been a beloved chocolate candy since 1941, but its iconic packaging has undergone numerous transformations throughout its history. This trivia question tests your knowledge of a significant packaging innovation that changed how consumers interact with this famous product. Do you know your candy history well enough to identify when this brand made a practical change to its packaging that's now considered standard across many confectionery products?

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1996
1983
2002
1975