Which One of the Following Is the Preferred Licensing Model

Which one of the following is the preferred licensing model?

A) Local licensing because it ties the package license to the IP-address of the gateway and has no dependency of the Security Management Server.
B) Central licensing because it ties the package license to the IP-address of the Security Management Server and has no dependency of the gateway.
C) Local licensing because it ties the package license to the MAC-address of the gateway management interface and has no Security Management Server dependency.
D) Central licensing because it ties the package license to the MAC-address of the Security Management Server Mgmt-interface and has no dependency of the gateway.