I’m looking for some clarification on eBay rules please.

Is it ok to have two accounts – one business, one personal – business for selling, personal for buying?
It is ok to have two accounts – two business, selling different items as each other but with the same business details (ie company number, VAT etc?)
Is it ok to have two accounts – two business, selling the same items as each other and with the same business details (ie company number, VAT etc?)
Is it ok to have three or more accounts – all business, selling the same items as each other and with the different business details (ie company number, VAT etc?)
Is it ok to have three or more accounts – all business, selling the same items as each other and with the same business details (ie company number, VAT etc?)

Can you clear up this query and let me know which part of eBay rules apply to the above scenarios please?