A 3-year-old boy (weight 30 kg) presents to the clinic with irritability, a temperature of 38.5°C, and mild ear pain. On examination, his ear is erythematous with a copious amount of cerumen throughout the ear canal. He has had two previous episodes of AOM at 18 months and 2 years. For treatment of his latest episode, he received amoxicillin and developed a rash on his trunk after 5 days of therapy. According to the AOM guidelines, which therapy would be best for this patient?
a. Cefdinir 420 mg orally every 12 hours × 10 days.
b. Observation and pain management for 48-72 hours.
c. Azithromycin 300 mg orally × 1; then 150 mg orally once daily × 4 days.
d. Ceftriaxone 1000 mg intramuscularly × 3 doses.