When using an ECG rhythm strip to quickly estimate the ventricular rate for a client, the nurse should:

print a 1-minute ECG strip and count the number of QRS complexes.

calculate the number of small squares between one QRS complex and the next one and divide by 1500.

count the number of large squares in the R-R interval and divide by 300.

use the 3 second markers to count the number of QRS complexes in 6 seconds and multiply by 10.