Explanation:

- Option 1: O

- O negative is considered the universal donor because it can be given to patients of any blood type.

- People with O positive can donate to any positive blood type.

- Option 2: B

- B type can donate to B and AB blood types.

- It is not a universal recipient, as it can only receive from B or O.

- Option 3: AB

- AB positive is the universal recipient as it can receive blood from all types because it has both A and B antigens and no anti-A or anti-B antibodies.

- AB negative can receive from all negative blood types.

- Option 4: A

- A type can donate to A and AB blood types.

- Receives from A and O blood types.

Correct Answer: Option 3: AB