Which of the following statements are correct regarding the process of RNA interference?
(i) RNAi has been used to prevent nematode infestation of tobacco plants.
(ii) RNAi takes place in all eukaryotic organisms as a method of cellular defense.
(iii) The method involves silencing of specific mRNA using a complementary dsDNA molecule that binds and prevents the translation of mRNA.
(iv) Using retrovirus vectors, nematode-specific genes were introduced in the host plant.

• A

  (i) and (ii)

• B

  (i) and (iii)

• C

  (ii) and (iii)

• D

  (ii) and (iv)