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The correct choice highlights the essential diagnostic tools required for heart allocation, particularly in the context of transplant evaluation. The use of a 12-lead electrocardiogram (EKG) is crucial because it provides a comprehensive assessment of the heart's electrical activity, helping to identify arrhythmias and other cardiac conditions that may affect eligibility for transplantation. Echocardiography (ECHO) is equally important as it offers detailed imaging of the heart's structure and function, revealing information about the size and shape of the heart, the condition of the heart valves, and the overall cardiac output. Together, these tools are vital in determining the appropriateness of heart allocation based on the patient's cardiac status.

Other options present diagnostic tools that, while valuable in various medical contexts, are not the primary or required tools specifically for heart allocation decisions. The combination of EKG and ECHO offers a direct assessment of the heart's functional and electrical status, which is pivotal in the transplant process.