When assisting with a vacuum-assisted vaginal delivery, the nurse is aware that adherence to which guidelines for the vacuum device will minimize the nurse's liability in vacuum-assisted vaginal births? Select all that apply.

Pump up the vacuum manually to the pressure indicated on the pump.

Recognize that cup detachment (pop off) is a warning sign.

The cup should not be on the fetal head for longer than 5 to 10 minutes.

The procedure is timed from insertion of the cup into the vagina until the birth.

Understand that pressure should be released between contractions.