Which of the following entertainment industry mergers created the largest combined film and television content library when it was completed in 2019?

In recent years, the film and television industry has undergone massive consolidation as streaming platforms battle for content and subscribers. Major entertainment conglomerates have merged to create powerful entities with vast content libraries. This trivia question focuses on one of the most significant brand mergers in the entertainment industry that reshaped how content is produced and distributed.

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Disney's acquisition of 21st Century Fox
AT&T's purchase of Time Warner (now Warner Bros. Discovery)
Amazon's acquisition of MGM Studios
Comcast's purchase of NBCUniversal