Which two major dictionary brands merged in 2012 to form a unified global English language reference powerhouse?

Language defines how we communicate, and dictionaries have been the cornerstone of linguistic standardization for centuries. In the publishing world, dictionary brands carry significant cultural weight and academic authority. This poll tests your knowledge about one of the most significant mergers in linguistic publishing history that dramatically changed how we access language resources today.

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Merriam-Webster and Oxford University Press
Macmillan Dictionary and Cambridge Dictionary
Dictionary.com and Thesaurus.com
Macmillan Dictionary and Dictionary.com (both owned by IAC and merged their digital operations)