J-BusinessDirectory - Question about the content plugin

I have a few questions about the content plugin.

- Are the articles created as normal Joomla content articles and shown in the default Joomla blog, or will they appear on the business owner's page only?

- On my website, the plan is to offer the content feature only to premium-tier members, and not to free or lower-tier members. Is this possible with the extension or will all users be able to create content articles?

- Is it possible to limit the number of articles business owners are allowed to post, to prevent a large amount of spam articles?