Which of the following is the best leaving group? 
Definitions:
Watson
An IBM supercomputer that combines artificial intelligence and sophisticated analytical software for optimal performance as a "question answering" machine.
Paywall
An arrangement whereby access to online content is restricted to users who have paid to subscribe or purchase access.
Daily Fantasy Sports
Competitive online events where players assemble virtual teams of real athletes and score points based on the statistical performances of those athletes in real games.
IT Infrastructure
The composite hardware, software, network resources, and services required for the operation and management of an enterprise IT environment.
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