Which of the following statements are true about the imperial examination system? Select all that apply.

A. Only the wealthy were eligible for the imperial examination system.
B. Anybody was eligible to submit to the imperial examination system.
C. It was based on the Confucianism ideal of fairness and began during the Han Dynasty.
D. It was created during the Zhou Dynasty and focused on royalty.

B. Anybody was eligible to submit to the imperial examination system.

C. It was based on the Confucianism ideal of fairness and began during the Han Dynasty.