A 55-year-old patient with a history of hypertension is undergoing a routine ECG as part of their annual check-up. The ECG reveals a first-degree AV block. Which of the following statements about first-degree AV block is correct?

First-degree AV block is characterized by a prolonged PR interval greater than 0.20 seconds.

First-degree AV block is a type of heart block where some atrial impulses fail to reach the ventricles.

Patients with first-degree AV block typically present with symptoms such as syncope or dizziness.

First-degree AV block often requires immediate treatment with a pacemaker.