A nurse is caring for a full term client in labor who is prescribed continuous fetal monitoring. On examination, the nurse determines the client's membranes are intact. Which of the following assessment methods should the nurse implement?

A. A transvaginal fetal Doppler is not commonly used for continuous monitoring and is typically reserved for early pregnancy. B. An external ultrasound transducer is appropriate for continuous fetal monitoring when the membranes are intact. It is noninvasive and safe for use during labor. C. A DeLee Hillis fetoscope is used for intermittent auscultation, not continuous monitoring. D. An internal fetal scalp electrode requires ruptured membranes and cervical dilation; it is contraindicated with intact membranes.