Which of the following are the essential functions of fuel cells?1. The charging (or electrolyser) function in which the chemical AB is decomposed to A and B2. The storage function in which A and B are held apart.3. The charge function in which A and B are charged with the simultaneous generation of electricity.

Which of the following are the essential functions of fuel cells?1. Th

1.	Which of the following are the essential functions of fuel cells?1. The charging (or electrolyser) function in which the chemical AB is decomposed to A and B2. The storage function in which A and B are held apart.3. The charge function in which A and B are charged with the simultaneous generation of electricity.
A.	1 and 3 only
B.	2 and 3 only
C.	1 and 2 only
D.	1, 2 and 3
Answer» D. 1, 2 and 3