In leagues outside of North America, what is the promotion and relegation system?
a. The worst-performing teams are promoted to a higher level and the higher-performing teams are demoted to a lower level.
b. The worst-performing coaches are demoted to a lower level and the higher performing coaches are promoted to a higher level.
c. The worst-performing players are demoted to a lower level and the higher performing players are promoted to a higher level.
d. The worst-performing teams are demoted to a lower level and the higher performing teams are promoted to a higher level.