In vegetative reproduction by grafting:

I. The vascular cambium tissues of the stock and scion plants must be placed in contact with each other
II. The scion contains the desired genes to be duplicated in future production by the stock/scion plant
III. Generally, grafting is performed when the scion is dormant

1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct