Final answer:
Health Information Exchange facilitates the sharing of healthcare information within a hospital, enterprise system, region, or across a nation, thus all the listed options are correct.
Step-by-step explanation:
Health Information Exchange (HIE) enables the interoperable linkage of health care information across various levels of healthcare systems. This can include within a single hospital, an enterprise system, a specific region, or even across a nation. Therefore, the correct answer is e. All of the above. HIE aims to ensure that health professionals and patients have access to the right health information at the right time, which can improve the speed, quality, safety, and cost of patient care.