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Final answer:The field of Internal Medicine employs the most physicians due to the wide umbrella of subspecialties it encompasses. Option d is correct.Explanation:The specialty that employs the largest numbers of physicians isInternal Medicine. WhileCardiologymight appear as a common specialty, it's a subspecialty under Internal Medicine. Cardiologists are indeed a significant part of the medical field, specializing in the diagnosis and treatment of heart diseases.After a cycle of rigorous training and examinations that spans approximately 10 years, physicians can become board-certified cardiologists.However, it's important to note that Internal Medicine covers a broader range, encompassing different subspecialties beyond Cardiology, such as Gastroenterology, Endocrinology, Nephrology, etc. Therefore, in terms of sheer numbers, Internal Medicine, with its numerous subspecialties, would employ the largest number of physicians.Learn more about Internal Medicine here:brainly.com/question/32275007#SPJ11...