Which subscription-based innovation did Merriam-Webster introduce in 2011 that revolutionized its business model and helped it transition from print to digital dominance?

In the world of language and linguistics, dictionaries aren't just reference books—they're evolving brand products with fascinating business histories. This poll tests your knowledge about how one of the most recognized dictionary brands adapted its business model to survive in the digital era, transforming from a print-focused publisher to a modern linguistic platform. Can you identify the pivotal subscription strategy that changed the dictionary landscape?

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The Unabridged Premium Plan, offering complete historical etymologies and specialized technical vocabularies for professional linguists and institutions
Merriam-Webster's Word of the Day podcast subscription service, which became their primary revenue stream
The removal of display advertising in favor of a tiered subscription model offering ad-free experience and advanced linguistic tools
Dictionary-as-a-Service (DaaS), providing API access to their lexical database for third-party developers and educational platforms