ECG identified by the PR interval tends to become longer with every succeeding ECG complex until there is a P wave not followed by a QRS is observed in

Options :

1. Second-Degree Atrioventricular Block, Type I

2. Second-Degree Atrioventricular Block, Type II

3. Third-Degree Atrioventricular Block

4. First-Degree Atrioventricular Block, Type II