The correct answer is B because Workday uses effective dating to manage changes to benefit plans over time, including contribution limits for plans such as Health Savings Accounts (HSAs). To ensure that new contribution limits apply for the upcoming open enrollment period, administrators must update the HSA plan with an effective date aligned to the start of the new benefit plan year. This allows the system to maintain historical accuracy while applying updated limits prospectively for future enrollments.

By entering the new limits with the correct future effective date, Workday ensures that employees enrolling during open enrollment will see and be governed by the updated contribution thresholds. Option A is incorrect because HSA contribution limits are configured within the benefit plan, not solely in payroll. Option C is incorrect because Workday does not prompt administrators automatically to update limits during enrollment events. Option D is also incorrect because Workday does not automatically adjust HSA limits; administrators must manually update them to reflect regulatory changes. Proper use of effective dating ensures accurate and compliant benefit plan configuration across plan years.