Final answer:
In the situation of the umbilical cord presenting through the vagina during active labor, the correct course of action is to place the mom supine with hips elevated, administer oxygen, and transport her to a medical facility.
Step-by-step explanation:
When faced with the situation of the umbilical cord presenting through the vagina during active labor, the correct course of action is to place the mom supine with hips elevated, administer oxygen, and transport her to a medical facility. This option is listed as number 4 in the given choices. Pulling on the cord, massaging the uterus, or replacing the cord in the vagina are all incorrect and potentially harmful actions that should not be taken in this situation.