Answer: b.
Explanation:
An intranet is like a "private Internet" that mediates the access to some sensitive information spread out in different web pages and documents, using the TCP/IP protocol suite, through an access portal, to which only authorized individuals can access.
To anyone able to access the portal, all documentation is accessible as it were on the public Internet, which allows for instance, to a partner in Argentina to access in a secure way, in real time, to track a PO issued to a company in Singapore.