When Needing to Estimate the Ventricular Rate Quickly for a Patient

When needing to estimate the ventricular rate quickly for a patient with a regular heart rhythm using an ECG strip, the nurse will

A) print a 1-minute ECG strip and count the number of QRS complexes.
B) count the number of large squares in the R-R interval and divide by 300.
C) calculate the number of small squares between one QRS complex and the next and divide into 1500.
D) use the 3-second markers to count the number of QRS complexes in 6 seconds and multiply by 10.