What are the options commissions for deribit?

Could you please clarify what the options commissions are for Deribit? Are there different fees for opening and closing positions, or do they vary based on the type of options traded? Additionally, does Deribit offer any discounts or promotions for high-volume traders? Understanding the commission structure is crucial for any investor looking to trade options on this platform, so any insight you could provide would be greatly appreciated.