Which of the following statements is incorrect?
1. | A person of ‘O’ blood group has anti ‘A’ and anti ‘B’ antibodies in his blood plasma. |
2. | A person of ‘B’ blood group can’t donate blood to a person of ‘A’ blood group. |
3. | Blood group is designated on the basis of the presence of antibodies in the blood plasma. |
4. | A person of AB blood group is universal recipient. |