Which of the following statements is correct for steam boiler?
(A) Boiler secondary heat transfer surface include super-heater, economizer and air pre-heater.
(B) Boiler primary heat transfer surface includes evaporator section, super heater section and reheat section.
(C) Boiler primary heat transfer surface includes evaporator section, economizer and super-heater section.
(D) Boiler secondary heat transfer surface includes evaporator section, economizer and air pre-heater