Which of the following dynamometer type differs from an Epicyclic train dynamometer?

Which of the following dynamometer type differs from an Epicyclic train dynamometer? Correct Answer Prony brake dynamometer

Prony brake dynamometer is an absorption dynamometer and uses all the energy obtained by the engine to convert it into heat, whereas the remaining three are transmission dynamometers.

Related Questions

Statement (I): The epicyclic gear train has a central gear and an epicyclic gear which produces epicyclic motion being moved by a crank arm. Statement (II): The arm contains the bearings for the epicyclic gear to maintain two gears in mesh. 
Statement (I): In an epicyclic gear train, the size of the gearbox is smaller than that of the spur gearbox for the same horsepower and the same velocity ratio. Statement (II): In an epicyclic gearbox, more than one pair of gear pinion contacts always exist, whereas it is not so in spur gearbox.
Which of the following gears is not a part of an epicyclic train dynamometer?