The correct answer is option 3, AB-group.

A person with AB blood type is known as a universal recipient, as they can receive blood from any blood type. This is because individuals with AB blood type have both A and B antigens on their red blood cells, making them compatible with all other blood types.

In terms of donating blood, AB individuals can donate blood to individuals with AB blood type, as they share the same antigens. However, they can also donate to individuals with A-group, B-group, and O-group blood types. This is because the AB blood type does not produce antibodies against either A or B antigens, allowing them to donate to people who have these antigens.

Therefore, option 3 is correct as a person with AB-group blood can donate blood to a person with AB-group blood.