When Membrane Potential Is at the Equilibrium Potential for an Ion

Multiple Choice

When membrane potential is at the equilibrium potential for an ion, there is/are

A) an inward net movement of ions.
B) no net movement of ions across the membrane (equal in and out) .
C) an outward net movement of ions.
D) no movement of ions in either direction (in or out) .
E) equal numbers of the permeant ion inside and outside the cell.