a) A car has a 12V battery.
g) both c and f are correct
b) A car has a 24V battery.
c) A car has a 75V battery.
d) A car must be charged using a 12V boost.
e) A car can be charged by a 30V boost and higher.
f) A car must be charged by a 75V boost and lower.
h) both a and d are correct