Until recently research has shown that it is beneficial, what was discouraged in the workplace?

Name: Until recently research has shown that it is beneficial, what was discouraged in the workplace?
Brand: Quizplus
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Question

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Until recently, it was discouraged for coworkers and managers to form close friendships in the workplace. However, recent research has shown that these friendships can actually have benefits for productivity and employee satisfaction. B, C, and D are not supported by the given information.

Until Recently Research Has Shown That It Is Beneficial, What