When Assessing the Relative Advantages and Disadvantages of Internal and External

When assessing the relative advantages and disadvantages of internal and external electronic fetal monitoring,nurses comprehend that both:

A) can be used when membranes are intact.
B) measure the frequency, duration, and intensity of uterine contractions.
C) may need to rely on the woman to indicate when uterine activity (UA) is occurring.
D) can be used during the antepartum and intrapartum periods.