One drawback to performing the butterfly method is the ________.

Which of the following statements regarding an EMS provider's role during a trench rescue is correct?

A) It is crucial for the EMS provider to be in the trench to provide emergency care during the rescue attempt. B) Trench rescue is a part of a paramedic's training, so he or she is properly trained to enter a trench safely. C) Due to a lack of proper training, EMS providers should remain at least 50 yards away from the trench at all times. D) EMS providers should attempt to make contact with the patient, but should not enter the trench and attempt rescue.

Avf

A) is a precordial lead. B) is an augmented lead. C) is a bipolar lead. D) has its positive pole on the left arm.