Which of the following statements is most appropriate for

Which of the following statements is most appropriate for recombinant antibody production in transgenic plants?

1. A very high level expression is always obtained
2. Light promote more antibody production
3. Such antibodies are free from other antigen of animal origin
4. Functional antibody cannot be produced in plants

Its cross reactivity free in plant as such antibodies can be susceptible for cross reactivity in animal system.