Which of the following statements (with regard to earth pressure) are correct?
A. Any movement of the retaining wall away from the fill corresponds to active earth pressure.
B. Under earthquake loading, the pore pressure decreases in saturated silty soil.
C. Coulomb's earth pressure theory does not take the roughness of wall into consideration.
D. Rankine's earth pressure theory considers that the retaining wall has a vertical backfill.