Final answer:
The individual with blood type O negative is considered a universal donor, as their blood can be donated to recipients of any ABO/Rh blood type without causing an immune response.
Step-by-step explanation:
The blood type considered the universal donor is O negative (O-). Individuals with this blood type can donate blood to any other blood type because their red blood cells lack A or B antigens, which prevents an immune response in the recipient. In contrast, AB positive individuals are considered universal recipients since they can receive blood from any blood type, having both A and B antigens and no anti-A or anti-B antibodies.