What is set up within a Benefit Group?

The correct choice pertains to the Enrollment Rules and Waiting Period, as these elements are integral components of how benefits are structured within a Benefit Group in Workday. When a Benefit Group is established, it includes various parameters and configurations that dictate how employees can enroll in benefits.

Enrollment Rules determine the eligibility requirements and conditions under which employees can sign up for certain benefits, while Waiting Periods specify the time an employee must wait before becoming eligible to receive specific benefits. These configurations ensure that the benefits administration process is efficient, compliant, and tailored to organizational policies and employee needs.

The other options do not align with the focus of a Benefit Group. Employee performance criteria, workplace diversity metrics, and training and development plans are related to different aspects of HR management and do not involve the specific structures or rules that govern benefits enrollment and eligibility.