Which description is NOT a topology where a central services VPN would be used?

Which description is NOT a topology where a central services VPN would be used?

A.
A service provider offers services to all customers by allowing them access to a common VPN.

B.
Two or more companies want to exchange information by sharing a common set of servers.

C.
A security-conscious company separates its departments and allows them to access only to common servers.

D.
Several interconnected subsidiaries of a company require optimal communication between many sites.