A parallel plate capacitor is connected to a battery for charging. after some time, while the battery is still connected to the capacitor, the distance between the capacitor plates is doubled.
which of the following statements are true ?

a) the charge on the plates does not change.

b) the capacitance doubles.

c) the potential difference of the battery is halved.

d) the electric field between the plates is halved.

e) the potential difference across the plates does not change.

f) none of the above.