Drake United released a statement saying, "The production and supply of the medical supplies that we produce have been severely disrupted due to an illegal strike and the actions of the union. We had no other option but to issue a lockout. We appeal to union leaders to reach an agreement so that we may continue producing medical supplies that so many in our community need." This is an example of:

a$.$ a strike, a union negotiation tactic.

b$.$ a lockout; a union negotiation tactic.

c$.$ an injunction; management negotiation tactic.

d$.$ publicity; a management negotiation tactic.

e$.$ publicity; a union negotiation tactic.