Three distinct antigens X, Y and Z were used to raise antibodies.

Three distinct antigens X, Y and Z were used to raise antibodies. Antigen Z was injected in a mouse on day zero followed by the administration of antigens X and Y on day 28. A second injection of antigen X was administered on day 70. The antibody titers were monitored in the serum every day and the results are shown below:

Which one of the following statements regarding the antibody titers in the serum is INCORRECT ?

1. Z-specific IgG will be high on day 14
2. X-specific antibody titer will be high on day 84
3. X-specific IgG will be high on day 42
4. Y-specific IgG will be high on day 84

Y- specific IgG will be high on day 84