In Assisting with the Two Factors That Have an Effect

In assisting with the two factors that have an effect on fetal status,namely pushing and positioning,nurses should:

A) Encourage the woman's cooperation in avoiding the supine position
B) Advise the woman to avoid the semi-Fowler position
C) Encourage the woman to hold her breath and tighten her abdominal muscles to produce a vaginal response
D) Instruct the woman to open her mouth and close her glottis,letting air escape after the push