AIDS is caused by HIV. Among the following, which one is not a mode of transmission of HIV?

1. Transfusion of contaminated blood
2. Sharing the infected needles
3. Shaking hands with infected persons
4. Sexual contact with infected persons

(c) Transmission of HIV-infection generally occurs by

(i) Sexual contact with infected person
(ii) Transfusion of contaminated blood and blood products.
(iii) Sharing infected needles as in the case of intravenous drug abusers

(iv) Infected mother to her child through placenta.
Shaking hands with infected persons is not a mode of transmission of HIV.