How many of the above are alternative powertrain vehicles?

How many of the above are alternative powertrain vehicles?
Q. Consider the following types of vehicles : I. Full battery electric vehicles II. Hydrogen fuel cell vehicles III. Fuel cell electric hybrid vehicles How many of the above are alternative powertrain vehicles? (a) Only one (b) Only two (c) All the three (d) None Correct Answer : (c) All the three

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