What activities could an HR professional engage in to attract, recruit, and retain a diverse workforce?

I have a review question at the end of a chapter in my human resource text book. I've really never had any experience in human resources. Can you please help me answer this question? I'm sure there are a lot of things a professional in HR could do, but the chapter didn't go into it much. Thank you so much for your time and effort.

What activities could an HRprofessional engage in to attract,recruit, and retain a diverseworkforce?