Which of the Following Accurately Describes the Mechanism of Action

Which of the following accurately describes the mechanism of action of digoxin?

A) Digoxin stimulates Na/K ATPase. Stimulation of Na/K ATPase increases intracellular concentration of Na+ ions. Increased intracellular Na+ decreases the activity of the Na/Ca exchanger and allows intracellular Ca++ concentrations to increase. Increased intracellular Ca++ increases the formation of actinomyosin and increases the force of myocardial contractions.
B) Digoxin binds to and inhibits Na/K ATPase. Inhibition of Na/K ATPase decreases intracellular concentration of Na+ ions. Decreased intracellular Na+ increases the activity of the Na/Ca exchanger and allows intracellular Ca++ concentrations to decrease. Decreased intracellular Ca++ increases the formation of actinomyosin and increases the force of myocardial contractions.
C) Digoxin binds to and inhibits Na/K ATPase. Inhibition of Na/K ATPase increases intracellular concentration of Na+ ions. Increased intracellular Na+ decreases the activity of the Na/Ca exchanger and allows intracellular Ca++ concentrations to increase. Increased intracellular Ca++ increases the formation of actinomyosin and increases the force of myocardial contractions.
D) None of the above are correct.