The correct answer is A because this scenario describes a benefit that employees may elect during the year as a new enrollment opportunity, which means the event belongs on the Start/Waive tab of the Enrollment Event Rule. The requirement also states that only the gym membership plan should be available and that both coverage and payroll deductions should begin on the first of the following month. The Start/Waive configuration is where Workday controls which coverage type is opened for election and how coverage and deduction effective dates are calculated for that event.

Option B is incorrect because the Loss of Coverage tab is used when coverage is ending, not when a worker is newly electing a plan. Option C is also incorrect because it would start coverage and deductions on the event date, which does not meet the stated timing requirement. Option D is incorrect because enrollment event rules are driven by event types, not by adding a coverage type in place of the event itself. Therefore, the administrator should add the gym membership event type to Start/Waive and configure the start logic for the first of the following month.