Option 1 states that blood group AB has no antigen. This statement is incorrect. Blood group AB contains both A and B antigens on the surface of the red blood cells.

Option 2 states that blood group AB has no antibody. This statement is correct. Blood group AB individuals do not produce antibodies against either A or B antigens.

Option 3 states that blood group AB has neither antigen nor antibody. This statement is incorrect, as blood group AB has antigens on the red blood cells but does not produce antibodies against A or B antigens.

Option 4 states that blood group AB has both antigen and antibody. This statement is incorrect. Blood group AB has antigen (A and B) on the red blood cells, but no antibodies are produced against A or B antigens.

The correct answer is option 2, as blood group AB does not have antibodies.