In the 20th century, healthcare shifted from a focus on only treating the ill, to promoting routine screenings for early detection and treatments. As life expectancy increases, the need to assess patients' potential risk factors through family and personal risk assessments has been recognized. This can help patients to make lifestyle changes to prevent disease and disability. This focus of this latest shift is from:
A. Secondary prevention to primary prevention.
B. Primary prevention to tertiary prevention.
C. Tertiary prevention to secondary prevention.
D. Primary prevention to secondary prevention.