A postpartum unit nurse is preparing to care for a client who has just delivered a healthy newborn infant. In the immediate postpartum period

A postpartum unit nurse is preparing to care for a client who has just delivered a healthy newborn infant. In the immediate postpartum period, the nurse plans to take the client's vital signs:
a) Every hour for the first 2 hours and then every 4 hours
b) Every 30 minutes during the first hour and then every hour for the next 2 hours
c) Every 5 minutes for the first 30 minutes and then every hour for the next 4 hours
d) Every 15 minutes during the first hour and then every 30 minutes for the next 2 hours.