Which of the Following Is an Incorrect Statement Regarding Trade-Secret

Which of the following is an incorrect statement regarding trade-secret protection?

A) Competitors may not legally discover a trade secret by doing reverse engineering.
B) Competitors may legally discover a trade secret by going on public tours of plants and observing the use of the trade secret.
C) Lawful discovery of a trade secret means there is no longer a trade secret to be protected.
D) An invention may be considered a trade secret.
E) A design may be considered a trade secret.