The Nurse Notes That Shelly's ECG Has a Rate of 78

The nurse notes that Shelly's ECG has a rate of 78 bpm, normal P waves that precede each QRS complex, PR intervals of 0.16 seconds, and a regular pattern of shortening and lengthening of P-P and R-R intervals. The nurse should:

A) Notify the physician STAT.
B) Call for a STAT 12-lead ECG.
C) Prepare the client for cardiac catheterization.
D) Document the client as having sinus arrhythmia.