Consider the following statements about the strategy adopted to prevent the infestation of tobacco plants by the nematode Meloidegyne incognitia using RNA interference (RNAi):

1. The process of RNAi in prokaryotic organisms involves silencing specific mRNA.
2. The silencing is achieved by introducing complementary ssRNA molecules that bind to the target mRNA.
3. Agrobacterium vectors were used to introduce nematode-specific genes into the host plant.
4. The transgenic plants produced sense and anti-sense RNA, which formed dsRNA, initiating RNAi against the nematode.