Which of the Following Is NOT True of Cardiac Glycosides

Which of the following is NOT true of cardiac glycosides?

A) They increase the force of myocardial contractions, slow the heart rate, and slow the conduction of electrical impulses.
B) They decrease congestion in the heart by increasing the force that increases the amount of blood pumped from the heart.
C) Digitalis and digitoxin are identical medications and can be interchanged.
D) Digitalis preparations slow the heart rate, and patients should be taught to check their pulse prior to taking the medication.
E) The dosage of digitalis is individualized, and the major side effects are caused by overdosage.