Picketing to Force an Employer to Recognize an Uncertified Union

Picketing to force an employer to recognize an uncertified union is an unfair labor practice when:

A) the employer has refrained from recognizing another union as the collective bargaining agent of its employees.
B) picketing has been conducted with an aim to force the employer to engage in a secondary boycott.
C) a valid representation election has been conducted by the NLRB within the past 12 months.
D) picketing has been conducted for an unreasonable time, in excess of 10 days.
E) picketing has been conducted even with a petition for a representation election being filed with the NLRB.