A patient is experiencing anaphylaxis after receiving an antibiotic. Which interventions should the nurse prioritize to address this condition? (Select All that Apply.)

D Administer corticosteroids immediately. G Ensure the patient has a patent airway. A Administer epinephrine intramuscularly B Start intravenous access for fluid resuscitation. F Administer oral antihistamines. C Provide supplemental oxygen to the patient. E Place the patient in a supine position with legs elevated.