Which Is the Correct Statement Regarding Patient Preparation for an ECG

Which is the correct statement regarding patient preparation for an ECG?

A) Have the patients disrobe, except for underwear, and cover themselves with a blanket for warmth.
B) Let them know that they may chew gum in order to be relaxed during the procedure.
C) Make sure their legs and arms are relaxed by allowing their feet to turn out and placing their thumbs under their legs if the table is too narrow to support their arms.
D) Have the patients hold their breath during the 60 seconds of testing.