What is the difference between a steam drum and a mud drum in a water-tube boiler?

What is the difference between a steam drum and a mud drum in a water-tube boiler?

• A. Steam drum is for ash removal; mud drum stores condensate.
• B. Steam drum stores feedwater; mud drum stores condensate.
• C. Steam drum collects steam and provides surface for evaporation; mud drum collects sediment at bottom of tubes and supports risers.
• D. Steam drum preheats feedwater; mud drum cools the exhaust.

Answer: (C)