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 considered as alternative powertrain vehicles?

Correct Option: All the three

All three (Full battery electric vehicles, Hydrogen fuel cell vehicles, and Fuel cell-electric hybrid vehicles) are considered alternative powertrain vehicles. Traditional powertrains rely strictly on internal combustion engines (ICE) running on fossil fuels like petrol or diesel. Alternative powertrains encompass battery electric systems, fuel cell systems using hydrogen, and hybrid architectures combining fuel cells with electric batteries to reduce or eliminate tailpipe emissions.