Final answer:
The patient is engaged in tertiary prevention, which focuses on managing long-term health issues and improving function following serious interventions like a knee replacement surgery. The correct option is (3).
Step-by-step explanation:
The patient who had a total knee replacement surgery and is currently undergoing daily physical rehabilitation sessions is participating in tertiary prevention.
Tertiary prevention aims to help people manage complex, long-term health problems such as diseases, injuries, and chronic conditions to improve as much function as possible and prevent further deterioration.
Rehabilitation after surgery like knee replacement is a crucial part of this preventive level, ensuring that the joint replacement provides maximum benefit and the patient regains mobility and quality of life.