A nurse is preparing to measure an infant's vital signs. The nurse should use which of the following sites to assess a heart rate?

A. This site is used most often to obtain a pulse in infants during CPR or blood pressure measurement, but it does not provide the most accurate heart rate assessment. B. The radial artery is not typically used in infants because it is less accessible and not as easily palpated in this age group. C. The apical pulse (measured with a stethoscope at the 4th intercostal space, left midclavicular line) is the most accurate site for infants and children under 2 years old. It directly reflects the heart’s activity and is less affected by peripheral perfusion. D. The carotid artery is not typically used for assessing the heart rate in infants due to the risk of applying excessive pressure.