A company's employees are 40% male and 60% female. Of the male employees, 15% of them have advanced degrees and 20% of the female employees have advanced degrees. Let ‘c’ represent the total number of employees in the company. Which expression represents the percent of the company that has advanced degrees?

A - 0.15c + 0.20c

B - 0.40c(0.15) + 0.60c(0.20)

C - (0.40c - 0.15) - (0.60c - 0.20)

D - (0.40 + 0.15)c + (0.60 + 0.20)c