With reference to 'fuel cells' in which hydrogen rich fuel and oxygen are used to generate electricity. Consider the following statements.<br>1. If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by products.<br>2. Fuel cells can be used for powering buildings and not for small devices like laptop, computers.<br>3. Fuel cells produce electricity in the form of Alternating Current (AC).<br>Which of the statements given above is/are correct?

Correct Answer: Only 1