Is Baking soda chemically different from Baking powder?

• A. Yes, Baking soda is sodium carbonate while Baking powder is Sodium Bicarbonate
• B. Yes, Baking soda is sodium bicarbonate while Baking powder is a mixture of sodium bicarbonate and tartaric acid
• C. Yes, Baking soda is sodium bicarbonate while Baking powder is Calcium Carbonate
• D. No, they are identical chemically