With Reference to the National Labor Relations Act, Which of the Following

With reference to the National Labor Relations Act, which of the following statements is true of the employees' right to solicit support for a union?

A) Employees are allowed to solicit support for a union from their fellow employees during working times.
B) Employees are not allowed to solicit support for a union from their fellow employees on the employer's property.
C) Employees are allowed to distribute union literature at the workplace.
D) Employers in retail businesses can prohibit union solicitation by employees in areas where the public is invited.