Which of the following is responsible for the early repolarisation phase of the myocardial action potential.. Efflux of potassium

Which of the following is responsible for the early repolarisation phase of the myocardial action potential?
A.A Rapid sodium influx
B.A Rapid calcium influx
C.A Slow sodium efflux
D.A Slow efflux of calcium
E.A Efflux of potassium***