Which of the following best defines epidemiology in the context of public health?

A laboratory-based science that studies only the biological mechanisms of disease in cell cultures, excluding any analyses of distribution, population determinants, or public-health application of findings.

A discipline narrowly focused on identifying the microbe that causes a disease, without considering population-level patterns or prevention strategies beyond causation.

A clinical medical specialty that provides one-to-one patient diagnosis and treatment plans based solely on individual lab results rather than population trends, surveillance data, or prevention programs.

The study of the distribution, patterns, and determinants of health and disease in human populations used to inform disease control and prevention.