What is the relation between convection heat transfer coefficients of natural convection and forced convection?

• A. convection heat transfer coefficient of natural convection is lower than the convection heat transfer coefficient of forced convection
• B. convection heat transfer coefficient of natural convection is more than the convection heat transfer coefficient of forced convection
• C. convection heat transfer coefficients in both natural and forced convection are the same for same system
• D. unpredictable