Final answer:
Option 2). An individual is considered prehypertensive at a blood pressure reading of 130/80 mmHg according to the American College of Cardiology and the American Heart Association guidelines.
Step-by-step explanation:
A blood pressure reading that falls between 120 and 129 mm Hg at the systolic and less than 80 mm Hg at the diastolic phases is deemed prehypertensive, per the American College of Cardiology and American Heart Association guidelines. Consequently, option 2) 130/80 mmHg is the appropriate value at which a person is classified as prehypertensive according to these guidelines.
It is noteworthy that, although 120/80 mmHg is frequently cited as the upper limit of normal blood pressure, the latest guidelines place it closer to the prehypertensive border. The systolic pressure of 130 mm Hg is the starting point for measuring hypertension. This is the point at which a person is deemed to have high blood pressure and should be managed, frequently with medication and lifestyle modifications.