To avoid transmission of STDs:
I. Avoid sex with multiple partners.
II. Always have unprotected sex.
III. Use condoms during coitus.
IV. Avoid sex with unknown partners
V. Avoid sharing of needles
(1) All of the above
(2) I, III, IV, V
(3) I, II, III
(4) I, II, IV
(i) Avoid sex with unknown partners/multiple partners.
(ii) Always use condoms during coitus.
(iii) In case of doubt, go to a qualified doctor for early detection and get complete treatment if diagnosed with disease.