Who do you find most frustrating to work with?

We all have faced challenges when working with certain Teams. The experience is not smoothest and collaboration is difficult. We dread sometimes talking to them or getting on the same page. Which team is it for you. Please choose from this list or share a new one 1) Developers 2) Designers 3) C-Level 4) Customer Support 5) Sales 6) Digital Marketing 7) QA