Human Physiology question?

Question

True or False:

1) Tumorous cells are monitored and attacked by cytotoxic T lymphocytes in a part of the cell-mediated immune response called "immune surveillance

2) Only people with Rh-negative blood are capable of producing antibodies against the Rh protein.

3) Each antibody molecule is made up of four polypeptide chains in a Y configuration

Answer 1

1 AND 2 Are True but I don't know about #3