You see Paul dealing with Susan, an upset employee from another department. Susan is complaining about something that your department was supposed to do but didn't. You are in a back room and have not been seen by Susan. Paul is obviously frustrated and unable to deal with Susan effectively. You should:
a. Walk up to the pair and attempt to change the conversation.
b. Introduce yourself to Susan and offer your assistance.
c. Ask your supervisor to offer some interpersonal skills training to Paul.
d. Tell Paul that Susan is needed by the supervisor to end the situation.