Which of These Statements About How Sinus Arrhythmia Differs from Wandering

Which of these statements about how sinus arrhythmia differs from wandering atrial pacemaker is TRUE?

A) Sinus arrhythmia has uniform P wave shapes; wandering atrial pacemaker has at least three different shaped P waves.
B) Sinus arrhythmia has a regular rhythm; wandering atrial pacemaker is irregular.
C) Sinus arrhythmia has a heart rate of less than 100; wandering atrial pacemaker has a rate greater than 100.
D) Sinus arrhythmia is lethal; wandering atrial pacemaker is benign.