3. An electron is moved from the positive plate to the negative plate of a charged parallel plate arrangement.

How does the sign of the change in the system’s electrostatic potential energy compare to the sign of the change in electrostatic potential the electron experiences:

(a) both are positive,

(b) the energy change is positive but the potential change is negative,

(c) the energy change is negative but the potential change is positive, or

(d) both are negative?