I need help with this question for my Help Desk Homework.

Scenario #3: Your employer offers a program that compensates employees up to eight hours per month for performing community service. Because you were an English minor in college, you've chosen to volunteer your time with the reading literacy program one Saturday a month. At the first volunteer training meeting, the program coordinator, Dianne, tells the group that the program she runs is competing this year for a national honor and that she has modified the training materials to now include a strict dress code for volunteers. She doesn't want to be penalized in the eyes of the national program judges because some people weren't dressed professionally. You are well acquainted with how to dress in a business situation and have a number of business casual outfits. Dianne informs the group that she will not permit anyone to wear jeans or t-shirts when representing the program. She also does not want any tattoos or piercings visible. You have a tattoo on your forearm and an eyebrow piercing. Which conflict management method should be used with Dianne, and why?