Which of the Following Statements Concerning the Differences Between Action

Which of the following statements concerning the differences between action potentials in skeletal-muscle cells and in ventricular cardiac muscle cells is true?

A) Like skeletal-muscle cells, ventricular cardiac-muscle cells have a resting membrane potential closer to the sodium equilibrium potential than to the potassium equilibrium potential
B) Unlike skeletal-muscle cells, the initial depolarization of ventricular cells is mainly due to calcium influx, not sodium influx
C) After sodium influx through fast channels occurs in ventricular cells, an influx of calcium occurs.No such calcium influx occurs after sodium influx in the skeletal-muscle cells
D) Action potentials in skeletal-muscle cells are longer in duration than action potentials in cardiac cells
E) All of the choices are true