According to the NCERT text, infections transmitted through sexual intercourse are collectively called Sexually Transmitted Infections (STI) or Venereal Diseases (VD) or Reproductive Tract Infections (RTI) . Therefore, statements I, II, and III are correct. Statement IV is incorrect because the text explicitly defines IVF as In Vitro Fertilisation (fertilisation outside the body) , not Intra Vaginal Transfer.