In network management planning, which of the following description is correct? (Multiple choice)

In network management planning, which of the following description is correct? (Multiple choice)
A . Equivalent coefficient = resources occupied by physical network elements or ports/equivalent network elements occupy system resources; virtual network elements do not calculate management capabilities; pre-configured network elements are equivalent to virtual network elements.
B . It is recommended to use a centralized deployment scheme for network management deployment planning. Only consider the use of distributed deployment solutions when strongly requested by customers.
C . In the deployment planning of the network management subsystem, the NE manager subsystem to be installed needs to be determined according to the network element series. For example, if the Corba northbound interface is required, the Corba northbound subsystem needs to be installed.
D . Among other requirements, if the client is running on the server side, the management ability will be reduced by 60%, so it is recommended that the client and server side run separately.

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Answer: BC