The following description of Huawei eSight network management software, which is correct? (Multiple choice)

The following description of Huawei eSight network management software, which is correct? (Multiple choice)
A . The password of the admin user is lost. You can restore the default password only by reinstalling eSight.
B . eSight supports hierarchical management. In the hierarchical deployment mode, the upper-layer network management can add the lower-layer network management to the system and provide a link to open the lower-level network management interface.
C . The eSight application platform supports the integration with the upper-layer OSS system, and implements network alarm reporting through SNMP and interfaces with the OSS alarm system.
D . The password of the admin user is lost. You can reset the password by dialing 400.

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Answer: BC