Which of the Following Is False Regarding Trade Secret Protection

Which of the following is false regarding trade secret protection?

A) Competitors may not legally discover trade secrets by doing reverse engineering.
B) Competitors may discover secrets 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.