How do you most effectively communicate across different departments?

Flexibility and your ability to communicate orally (on the phone or in person), in writing (text or e-mail), or by file sharing. Communicate that you would ask each department about their communication preferences, which you know may vary. The marketing department may want all of their communication via voice. Accounting may want everything e-mailed. Make sure you focus on your ability to adjust your communication style accordingly.

Giving a hard and fast answer that you "only" communicate via one of those ways. The interviewer wants to know you can adjust your communication style if needed or requested.

"In my experience, it's not uncommon for different departments to prefer different methods of communication. I am good at communicating via oral or written communication, depending on the department's preference. I am comfortable with phone, voice mail, email, text, Zoom, or whatever is needed."