Immediately following a posterior superior alveolar block injection, the patient's face becomes quickly and visibly swollen. The immediate treatment should be to

refer the patient to a hospital

use pressure followed by cold packs over the swelling

use hot packs over the swelling.

administer diphenhydramine hydrochloride (Benadryl®) 50mg intravenously

administer 100mg hydrocortisone intravenously