Which of the following is/are related to biotechnology? (i) In vitro fertilisation. (ii) Synthesis of a gene. (iii) Correcting a defective gene. (iv) Developing a DNA vaccine.

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (iii) and (iv)
• D. (i), (ii), (iii) and (iv)