Which of the following statement is true about the relation between electric field and potential?

A. Electric field in the direction in which the potential decreases steepest
B. Magnitude of electric field is given by the change in the magnitude of potential per unit displacement normal to the equipotential surface at that point.
C. In the region of strong electric field, equipotential surfaces are far apart.
D. Both the statements (a) and (b) are correct.