Which famous beverage company faced massive backlash in 1985 after changing their flagship product's formula, leading to what's now considered one of the biggest marketing blunders in business history?

Throughout business history, certain marketing campaigns and product launches have become infamous for their unexpected negative reception. These blunders not only cost companies millions in revenue but often forced them to completely rethink their marketing strategies. Test your knowledge about one of the most notable product marketing failures that became a case study in business schools worldwide.

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Coca-Cola (with 'New Coke')
PepsiCo (with 'Crystal Pepsi')
Dr Pepper Snapple Group (with 'Dublin Dr Pepper')
Starbucks (with 'Mazagran' coffee soda)