With reference toFuel cellsin which hydrogen rich fuel and oxygen are used to generate electricity.Consider the following statements:1. if pure hydrogen is used as fuel, the fuel cell emits heat and water as by products.2. fuel cells can be used for powering buildings and not for small devices like laptop computers3. fuel cells produce electricity in form of alternating current(Ac)Correct option are?

• A. 1
• B. 2,3
• C. 1,3
• D. 1,2,3