Which of the Following Is True Regarding Protection Provided by Labor

Which of the following is true regarding protection provided by labor law to the picketing by the employees?

A) Both picketing designed to inform the public and picketing designed to prevent services and deliveries to the employer are protected by federal labor law.
B) None of the picketing involved was protected by federal labor law.
C) Picketing designed to inform the public was protected by federal labor law, but picketing that prevented the delivery of service and deliveries was not protected.
D) It is unclear whether the picketing was protected by federal law because protection depends on whether Warren employs over 50 employees.
E) It is unclear whether the picketing was protected by federal law because protection depends on whether Warren himself had violated labor laws.