A 4-day-old infant is brought into your office due to the new mother noticing signs of jaundice at home. The infant has a normal exam except for slightly jaundiced head and neck with normal newborn reflexes and appropriate responses. The jaundice started yesterday, and the mother notes the baby has not been breastfeeding very well. Which of the following is the most likely diagnosis for this infant and an appropriate recommendation for this new mother?

a. Physiologic jaundice: Send for evaluation of direct Coombs test
b. Pathologic jaundice: Tell the mother to breastfeed the infant more often
c. Physiologic jaundice: Tell the mother to breastfeed the infant more often
d. Pathologic jaundice: Send for evaluation of direct Coombs test