Which of the following is the correct technique to check for crowning in the assessment of a woman in labor?
a. Palpate the mother's abdomen to feel for the presenting part of the baby
b. Perform a vaginal exam to check for the appearance of the baby's head at the vaginal opening
c. Use a fetal monitor to track the baby's heart rate during contractions
d. Measure the dilation of the mother's cervix to determine the progress of labor