Huawei’s enterprise network management products are the eSight, and is divided into three versions: Starter Edition, Standard Edition, and, Professional Edition. Compared with the Standard Edition, what are the main characteristics of the following are added in the Professional Edition?
A . Professional Edition provides database backup tools
B . Support multi-user management
C . Support WLAN, MPLS VPN management
D . Support hierarchical management model
Answer: D