A user has an application server LPAR with a physical Ethernet adapter. They want to have a database LPAR also connected to the application LPAR via virtual Ethernet. Their security policies require a firewall between the application LPAR and database LPAR. Which of the following virtual Ethernet configurations satisfies the customer’s requirements？（）
- AThe application server，firewall，and database server on the same VLAN
- BThe application server and firewall on one VLAN，and the database server on a second VLAN
- CThe application server on one VLAN，and the database server and firewall on a second VLAN
- DThe application server and firewall on one VLAN，and the firewall and database server on a second VLAN