The unionized employees of the Premier Music Center, which owns and operates a large concert hall, have gone on strike and are picketing in front of the venue for alleged unfair labor practices. Premier and its employees have worked closely for years with the non-unionized security guards employed by Safe Event, Inc., who also work in the hall and the nearby parking lot. May the Premier employees picket in front of the Safe Event's office as well?
a. No, the union can only picket in front of the concert hall.
b. No, because Safe Event's employees are not unionized.
c. Yes, as long as the picket line is not violent.
d. Yes, if they have reason to believe that it will influence the Premier owners.