Understanding the Differences between Community Health, Public Health, and Individual Health

The topic of this post is about Community Health vs Public Health vs Individual/Personal Health. A) Explain the differences between the three (Community Health/Public Health/Individual Health). B) Which is the most important in improving the health outcomes of our nation (in other words, which of the three above has the most impact on getting people healthier, saving lives, lowering risk of diseases, etc.), AND why?