⟩ Explain 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 commonVPN.B. Two or more companies want to exchange information by sharing a common set ofservers.C. A security-conscious company separates its departments and allows them to accessonly to common servers.D. Several interconnected subsidiaries of a company require optimal communicationbetween many sites.