A universal blood donor must have which of the following blood types?

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You may think this question belongs in anatomy, but this question may pop up on your HESI A2 bio test.
There are four major blood groups, which are determined by the presence or absence of two antigens (A and B) on the surface of red blood cells. In addition to the A and B antigens, there is a protein called the Rh factor, which can be either present (+) or absent (-). This is how we get the 8 most common blood types (A+, A-, B+, B-, O+, O-, AB+, AB-).
People who need a blood transfusion can only take certain types of donated blood. However, everyone can accept type O- blood, which is why we call someone with O- blood a "universal donor" - because they can donate their blood to anybody, regardless of what type of blood the recipient has.
The chart below breaks down blood donor and recipient compatibility. You will see in the chart that all blood types can accept O- blood.
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A Universal Blood Donor Must Have Which of the Following