Which of the following is true about Digoxin

Digoxin acts by inhibiting Na+- K+ ATPase. Dose reduction is required in renal failure not liver failure. Hypokalemia increases the risk of Digoxin toxicity. Most common arrhythmia in Digoxin toxicity is most ventricular bigeminy. Most characteristic arrhythmia seen in Digoxin toxicity is Atrial tachycardia + AV Nodal blockade.