What is the difference between baseline schedule and updated schedule?

What is the difference between baseline schedule and updated schedule?

• A. Baseline is the current progress snapshot; updated schedule is the original plan.
• B. Baseline is the budget plan; updated schedule is the cash flow plan.
• C. Baseline includes changes; updated schedule is the approved plan.
• D. Baseline is the approved original plan; updated schedule reflects progress and changes.

Answer: (D)