听力原文： Thank you for coming to our seminar. Today I'd like to outline about current unemployment insurance system. Let's make sure you understand which of your employees are covered by unemployment insurance. Most services performed by an employee for an employer are covered by unemployment insurance—you'll be charged a co-pay for each of your employees. Even if an employee is temporary or seasonal, or working during a probationary or training period, his or her services are probably covered by unemployment insurance. But employees who are covered by unemployment insurance will be entitled to receive unemployment benefits only if they earn enough wages, and file a claim. It's up to them to understand these requirements.
Who is this talk probably addressed to？

A. Lawyers
B. Insurers
C. Employees
D. Business owners