Which innovative marketing and distribution strategy helped Merriam-Webster's Dictionary become a household name in the 19th century?

The retail book industry has seen many innovations, but few as impactful as the marketing and distribution strategy behind a certain revolutionary dictionary. This product transformed how we think about language reference materials and created a brand name so powerful it became synonymous with its product category. Test your knowledge about this landmark in linguistic retail history!

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Door-to-door subscription sales by traveling agents who pre-sold the dictionary before publication
Free dictionaries given to schools with the purchase of classroom chalkboards
Newspaper serialization where readers could collect dictionary pages weekly and assemble the book
A pioneering mail-order catalog system with monthly payment installments