This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to treat aural hematomas in dogs
Ask your vet about the surgical draining and sutures.
Surgical correction for hematomas is the most common form of correction. It typically requires general anesthesia to keep your dog calm and comfortable.

[1]. Radiotherapy uses ionization to remove acetic acid from the muscle and joint, so the incisions can be closed without requiring treatment. Your vet can also determine the readiness to have the scalpel inserted through the incision.
[2]. Once your dog is under, the vet will make an incision on the underside of the ear flap to drain all the blood out of the pocket. They will then flush out the pocket and place multiple stitches through the ear flap.
[3]. It also requires the vet to change into a working uniform. Usually, the vet will use white gauze with a sheet of oxygen and blood on it if he or she suspects surgery.
[4]. It is important for his bone to remain neurologically stable for three to four weeks before you perform surgery. Talk to your vet about dietary options and medications.
The answer is:
[2].