When negotiations appeared to be going in the wrong direction, a hvac systems company and its union representatives agreed to bring in a(n) this expert would serve as a facilitator to get negotiations back on track; whereas, if a(n) were solicited by both union and management, that person's decision in the situation would be binding. a) mediator; arbitratorb) arbitrator; advocatorc) mediator; advocatord) shop steward; mediator