What is the reason for choosing the Black and Decker battery charger in the modification process described in the text?

The Black and Decker battery charger has a capacity of 40 A/h.
The Black and Decker battery charger has a connection of 110 volts AC.
The Black and Decker battery charger is small in size.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) II and III are correct.