Which of the following is true about the heat transfer mode?

I. Radiation can be transferred in the presence and absence of a medium.

II. If the calculated value of heat transfer rate (Q) or heat flux (q) is negative, it means that the direction is the same as the one chosen.

III. Convection can take place in a stationary fluid.

IV. Forced convection is generated due to the difference in the buoyancy

V. Conduction can take place in a stationary fluid.

VI. Conduction can take place in a moving fluid.